diff --git a/VeterinaryClinic/VeterinaryClinic.sln b/VeterinaryClinic/VeterinaryClinic.sln
index e704da6..cfc0ad3 100644
--- a/VeterinaryClinic/VeterinaryClinic.sln
+++ b/VeterinaryClinic/VeterinaryClinic.sln
@@ -11,6 +11,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VeterinaryClinicContracts",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VeterinaryClinicDatabaseImplement", "VeterinaryClinicDatabaseImplement\VeterinaryClinicDatabaseImplement.csproj", "{BC172585-14F2-4484-8855-F00019F5EA5F}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VeterinaryClinicBusinessLogics", "VeterinaryClinicBusinessLogics\VeterinaryClinicBusinessLogics.csproj", "{F307552A-1BB6-430A-92C1-12B26CEEE1AA}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -33,6 +35,10 @@ Global
 		{BC172585-14F2-4484-8855-F00019F5EA5F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{BC172585-14F2-4484-8855-F00019F5EA5F}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{BC172585-14F2-4484-8855-F00019F5EA5F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F307552A-1BB6-430A-92C1-12B26CEEE1AA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F307552A-1BB6-430A-92C1-12B26CEEE1AA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F307552A-1BB6-430A-92C1-12B26CEEE1AA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F307552A-1BB6-430A-92C1-12B26CEEE1AA}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/AnimalLogic.cs b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/AnimalLogic.cs
new file mode 100644
index 0000000..4cd5c9a
--- /dev/null
+++ b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/AnimalLogic.cs
@@ -0,0 +1,130 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using VeterinaryClinicContracts.BindingModels;
+using VeterinaryClinicContracts.BusinessLogicsContracts;
+using VeterinaryClinicContracts.SearchModels;
+using VeterinaryClinicContracts.StoragesContracts;
+using VeterinaryClinicContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace VeterinaryClinicBusinessLogics.BusinessLogics
+{
+    public class AnimalLogic : IAnimalLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IAnimalStorage _animalStorage;
+
+        public AnimalLogic(ILogger<AnimalLogic> logger, IAnimalStorage animalStorage)
+        {
+            _logger = logger;
+            _animalStorage = animalStorage;
+        }
+
+        public bool Create(AnimalBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Create. Animal.Id: {Id}", model.Id);
+
+            if (_animalStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(AnimalBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Animal.Id: {Id}", model.Id);
+
+            if (_animalStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public AnimalViewModel? ReadElement(AnimalSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            _logger.LogInformation("ReadElement. Animal.Id: {Id}", model?.Id);
+
+            var element = _animalStorage.GetElement(model!);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement. Element not found");
+                return null;
+            }
+
+            _logger.LogInformation("ReadElement. Find Animal.Id: {Id}", element?.Id);
+            return element;
+        }
+
+        public List<AnimalViewModel>? ReadList(AnimalSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Animal.Id: {Id}. UserId: {DoctorId}", model?.Id, model?.UserId);
+
+            var list = model == null ? _animalStorage.GetFullList() : _animalStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList. Returned null list");
+                return null;
+            }
+
+            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(AnimalBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Update. Animal.Id: {Id}", model.Id);
+
+            if (_animalStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(AnimalBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Type))
+            {
+                throw new ArgumentNullException("Не указан вид животного", nameof(model.Type));
+            }
+            if (string.IsNullOrEmpty(model.Breed))
+            {
+                throw new ArgumentNullException("Не указан порода животного", nameof(model.Breed));
+            }
+            if (model.Age < 0)
+            {
+                throw new ArgumentNullException("Не указан возраст животного", nameof(model.Age));
+            }
+            if (model.UserId <= 0)
+            {
+                throw new ArgumentNullException("Не указан идентификатор пользователя", nameof(model.UserId));
+            }
+
+            _logger.LogInformation("CheckModel. Animal.Id: {Id}", model.Id);
+        }
+    }
+}
diff --git a/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/MedicationLogic.cs b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/MedicationLogic.cs
new file mode 100644
index 0000000..e44b370
--- /dev/null
+++ b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/MedicationLogic.cs
@@ -0,0 +1,131 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using VeterinaryClinicContracts.BindingModels;
+using VeterinaryClinicContracts.BusinessLogicsContracts;
+using VeterinaryClinicContracts.SearchModels;
+using VeterinaryClinicContracts.StoragesContracts;
+using VeterinaryClinicContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace VeterinaryClinicBusinessLogics.BusinessLogics
+{
+    public class MedicationLogic : IMedicationLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IMedicationStorage _medicationStorage;
+
+        public MedicationLogic(ILogger<MedicationLogic> logger, IMedicationStorage medicationStorage)
+        {
+            _logger = logger;
+            _medicationStorage = medicationStorage;
+        }
+
+        public bool Create(MedicationBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Create. Medication.Id: {Id}", model.Id);
+
+            if (_medicationStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(MedicationBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Medication.Id: {Id}", model.Id);
+
+            if (_medicationStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public MedicationViewModel? ReadElement(MedicationSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            _logger.LogInformation("ReadElement. Medication.Id: {Id}.", model?.Id);
+
+            var element = _medicationStorage.GetElement(model!);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement. Element not found");
+                return null;
+            }
+
+            _logger.LogInformation("ReadElement. Find Medication.Id: {Id}", element?.Id);
+            return element;
+        }
+
+        public List<MedicationViewModel>? ReadList(MedicationSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Medication.Id: {Id}. Name: {Name}", model?.Id, model?.Name);
+
+            var list = model == null ? _medicationStorage.GetFullList() : _medicationStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList. Returned null list");
+                return null;
+            }
+
+            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(MedicationBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Update. Medication.Id: {Id}", model.Id);
+
+            if (_medicationStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(MedicationBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Не указано название медикамента", nameof(model.Name));
+            }
+            if (string.IsNullOrEmpty(model.Description))
+            {
+                throw new ArgumentNullException("Не указано описание медикамента", nameof(model.Description));
+            }
+
+            _logger.LogInformation("CheckModel. Medication.Id: {Id}", model.Id);
+
+            var element = _medicationStorage.GetElement(new MedicationSearchModel
+            {
+                Name = model.Name
+            });
+            if (element != null && !element.Id.Equals(model.Id))
+            {
+                throw new InvalidOperationException("Медикамент с данным названием уже есть");
+            }
+        }
+    }
+}
diff --git a/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/ServiceLogic.cs b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/ServiceLogic.cs
new file mode 100644
index 0000000..17c6285
--- /dev/null
+++ b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/ServiceLogic.cs
@@ -0,0 +1,135 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using VeterinaryClinicContracts.BindingModels;
+using VeterinaryClinicContracts.BusinessLogicsContracts;
+using VeterinaryClinicContracts.SearchModels;
+using VeterinaryClinicContracts.StoragesContracts;
+using VeterinaryClinicContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace VeterinaryClinicBusinessLogics.BusinessLogics
+{
+    public class ServiceLogic : IServiceLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IServiceStorage _serviceStorage;
+
+        public ServiceLogic(ILogger<ServiceLogic> logger, IServiceStorage serviceStorage)
+        {
+            _logger = logger;
+            _serviceStorage = serviceStorage;
+        }
+
+        public bool Create(ServiceBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Create. Service.Id: {Id}", model.Id);
+
+            if (_serviceStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(ServiceBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Service.Id: {Id}", model.Id);
+
+            if (_serviceStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public ServiceViewModel? ReadElement(ServiceSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            _logger.LogInformation("ReadElement. Service.Id: {Id}. Name: {Name}", model?.Id, model?.Name);
+
+            var element = _serviceStorage.GetElement(model!);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement. Element not found");
+                return null;
+            }
+
+            _logger.LogInformation("ReadElement. Find Service.Id: {Id}", element?.Id);
+            return element;
+        }
+
+        public List<ServiceViewModel>? ReadList(ServiceSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Service.Id: {Id}. Name: {Name}", model?.Id, model?.Name);
+
+            var list = model == null ? _serviceStorage.GetFullList() : _serviceStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList. Returned null list");
+                return null;
+            }
+
+            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(ServiceBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Update. Service.Id: {Id}", model.Id);
+
+            if (_serviceStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(ServiceBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Не указано название услуги", nameof(model.Name));
+            }
+            if (model.Cost <= 0)
+            {
+                throw new ArgumentNullException("Не указан цена", nameof(model.Cost));
+            }
+            if (model.MedicationId <= 0)
+            {
+                throw new ArgumentNullException("Не указан идентификатор медикоментов", nameof(model.MedicationId));
+            }
+
+            _logger.LogInformation("CheckModel. Service.Id: {Id}", model.Id);
+
+            var element = _serviceStorage.GetElement(new ServiceSearchModel
+            {
+                Name = model.Name
+            });
+            if (element != null && !element.Id.Equals(model.Id))
+            {
+                throw new InvalidOperationException("Услуга с данным названием уже есть");
+            }
+        }
+    }
+}
diff --git a/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/UserLogic.cs b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/UserLogic.cs
new file mode 100644
index 0000000..4800fda
--- /dev/null
+++ b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/UserLogic.cs
@@ -0,0 +1,139 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using VeterinaryClinicContracts.BindingModels;
+using VeterinaryClinicContracts.BusinessLogicsContracts;
+using VeterinaryClinicContracts.SearchModels;
+using VeterinaryClinicContracts.StoragesContracts;
+using VeterinaryClinicContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace VeterinaryClinicBusinessLogics.BusinessLogics
+{
+    public class UserLogic : IUserLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IUserStorage _userStorage;
+
+        public UserLogic(ILogger<UserLogic> logger, IUserStorage userStorage)
+        {
+            _logger = logger;
+            _userStorage = userStorage;
+        }
+
+        public bool Create(UserBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Create. User.Id: {Id}", model.Id);
+
+            if (_userStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(UserBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. User.Id: {Id}", model.Id);
+
+            if (_userStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public UserViewModel? ReadElement(UserSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            _logger.LogInformation("ReadElement. User.Id: {Id}. Email: {Email}. Password: {Password}", model?.Id, model?.Email, model?.Password);
+
+            var element = _userStorage.GetElement(model!);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement. Element not found");
+                return null;
+            }
+
+            _logger.LogInformation("ReadElement. Find User.Id: {Id}", element?.Id);
+            return element;
+        }
+
+        public List<UserViewModel>? ReadList(UserSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. User.Id: {Id}. Email: {Email}. FullName: {FullName}", model?.Id, model?.Email, model?.FullName);
+
+            var list = model == null ? _userStorage.GetFullList() : _userStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList. Returned null list");
+                return null;
+            }
+
+            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(UserBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Update. User.Id: {Id}", model.Id);
+
+            if (_userStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(UserBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.FullName))
+            {
+                throw new ArgumentNullException("Не указано ФИО", nameof(model.FullName));
+            }
+            if (string.IsNullOrEmpty(model.Phone))
+            {
+                throw new ArgumentNullException("Не указан номер телефона", nameof(model.Phone));
+            }
+            if (string.IsNullOrEmpty(model.Password))
+            {
+                throw new ArgumentNullException("Не указан пароль", nameof(model.Password));
+            }
+            if (string.IsNullOrEmpty(model.Email))
+            {
+                throw new ArgumentNullException("Не указана электронная почта", nameof(model.Email));
+            }
+
+            _logger.LogInformation("CheckModel. User.Id: {Id}", model.Id);
+
+            var element = _userStorage.GetElement(new UserSearchModel
+            {
+                Email = model.Email
+            });
+            if (element != null && !element.Id.Equals(model.Id))
+            {
+                throw new InvalidOperationException("Пользователь с данной электронной почтой уже существует");
+            }
+        }
+    }
+}
diff --git a/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/VaccinationLogic.cs b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/VaccinationLogic.cs
new file mode 100644
index 0000000..9ff883b
--- /dev/null
+++ b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/VaccinationLogic.cs
@@ -0,0 +1,143 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using VeterinaryClinicContracts.BindingModels;
+using VeterinaryClinicContracts.BusinessLogicsContracts;
+using VeterinaryClinicContracts.SearchModels;
+using VeterinaryClinicContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+using VeterinaryClinicContracts.StoragesContracts;
+
+namespace VeterinaryClinicBusinessLogics.BusinessLogics
+{
+    public class VaccinationLogic : IVaccinationLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IVaccinationStorage _vaccinationStorage;
+
+        public VaccinationLogic(ILogger<VaccinationLogic> logger, IVaccinationStorage vaccinationStorage)
+        {
+            _logger = logger;
+            _vaccinationStorage = vaccinationStorage;
+        }
+
+        public bool Create(VaccinationBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Create. Vaccination.Id: {Id}", model.Id);
+
+            if (_vaccinationStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(VaccinationBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Vaccination.Id: {Id}", model.Id);
+
+            if (_vaccinationStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public VaccinationViewModel? ReadElement(VaccinationSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+
+            _logger.LogInformation("ReadElement. Vaccination.Id: {Id}.", model?.Id);
+
+            var element = _vaccinationStorage.GetElement(model!);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement. Element not found");
+                return null;
+            }
+
+            _logger.LogInformation("ReadElement. Find Vaccination.Id: {Id}", element?.Id);
+            return element;
+        }
+
+        public List<VaccinationViewModel>? ReadList(VaccinationSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. Vaccination.Id: {Id}. Name: {Name}", model?.Id, model?.Name);
+
+            var list = model == null ? _vaccinationStorage.GetFullList() : _vaccinationStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList. Returned null list");
+                return null;
+            }
+
+            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(VaccinationBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Update. Vaccination.Id: {Id}", model.Id);
+
+            if (_vaccinationStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(VaccinationBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Не указано названия прививки", nameof(model.Name));
+            }
+            if (model.DateInjection == DateTime.MinValue)
+            {
+                throw new ArgumentNullException("Не указана дата укола", nameof(model.DateInjection));
+            }
+            if (string.IsNullOrEmpty(model.ValidityPeriod))
+            {
+                throw new ArgumentNullException("Не указан срок действия", nameof(model.ValidityPeriod));
+            }
+            if (model.UserId <= 0)
+            {
+                throw new ArgumentNullException("Не указан идентификатор пользователя", nameof(model.UserId));
+            }
+            if (model.AnimalId <= 0)
+            {
+                throw new ArgumentNullException("Не указан идентификатор животного", nameof(model.AnimalId));
+            }
+
+            _logger.LogInformation("CheckModel. Vaccination.Id: {Id}", model.Id);
+
+            var element = _vaccinationStorage.GetElement(new VaccinationSearchModel
+            {
+                Name = model.Name
+            });
+            if (element != null && !element.Id.Equals(model.Id))
+            {
+                throw new InvalidOperationException("Прививка с таким названием уже существует");
+            }
+        }
+    }
+}
diff --git a/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/VisitLogic.cs b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/VisitLogic.cs
new file mode 100644
index 0000000..22abf64
--- /dev/null
+++ b/VeterinaryClinic/VeterinaryClinicBusinessLogics/BusinessLogics/VisitLogic.cs
@@ -0,0 +1,116 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using VeterinaryClinicContracts.BindingModels;
+using VeterinaryClinicContracts.BusinessLogicsContracts;
+using VeterinaryClinicContracts.SearchModels;
+using VeterinaryClinicContracts.StoragesContracts;
+using VeterinaryClinicContracts.ViewModels;
+using Microsoft.Extensions.Logging;
+
+namespace VeterinaryClinicBusinessLogics.BusinessLogics
+{
+    public class VisitLogic : IVisitLogic
+    {
+        private readonly ILogger _logger;
+        private readonly IVisitStorage _visitStorage;
+
+        public VisitLogic(ILogger<VisitLogic> logger, IVisitStorage visitStorage)
+        {
+            _logger = logger;
+            _visitStorage = visitStorage;
+        }
+
+        public bool Create(VisitBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Create. Visit.Id: {Id}", model.Id);
+
+            if (_visitStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(VisitBindingModel model)
+        {
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Id:{Id}", model.Id);
+            if (_visitStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        public VisitViewModel? ReadElement(VisitSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. DateFrom:{DateFrom}. DateTo:{DateTo}. VisitId:{Id}", model.DateFrom, model.DateTo, model.Id);
+            var element = _visitStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. VisitId:{Id}", element.Id);
+            return element;
+        }
+
+        public List<VisitViewModel>? ReadList(VisitSearchModel? model)
+        {
+            _logger.LogInformation("ReadList. VisitId:{Id}", model?.Id);
+            var list = model == null ? _visitStorage.GetFullList() : _visitStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
+        }
+
+        public bool Update(VisitBindingModel model)
+        {
+            CheckModel(model);
+            _logger.LogInformation("Update. Visit.Id: {Id}", model.Id);
+
+            if (_visitStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+
+        private void CheckModel(VisitBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (model.Date == DateTime.MinValue)
+            {
+                throw new ArgumentNullException("Не указана дата визита", nameof(model.Date));
+            }
+            if (model.UserId <= 0)
+            {
+                throw new ArgumentNullException("Не указан идентификатор пользователя", nameof(model.UserId));
+            }
+
+            _logger.LogInformation("CheckModel. Visit.Id: {Id}", model.Id);
+        }
+    }
+}
diff --git a/VeterinaryClinic/VeterinaryClinicBusinessLogics/VeterinaryClinicBusinessLogics.csproj b/VeterinaryClinic/VeterinaryClinicBusinessLogics/VeterinaryClinicBusinessLogics.csproj
new file mode 100644
index 0000000..a3334f9
--- /dev/null
+++ b/VeterinaryClinic/VeterinaryClinicBusinessLogics/VeterinaryClinicBusinessLogics.csproj
@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\VeterinaryClinicContracts\VeterinaryClinicContracts.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/VeterinaryClinic/VeterinaryClinicContracts/BusinessLogicsContracts/IVisitLogic.cs b/VeterinaryClinic/VeterinaryClinicContracts/BusinessLogicsContracts/IVisitLogic.cs
index d342804..29cd8d8 100644
--- a/VeterinaryClinic/VeterinaryClinicContracts/BusinessLogicsContracts/IVisitLogic.cs
+++ b/VeterinaryClinic/VeterinaryClinicContracts/BusinessLogicsContracts/IVisitLogic.cs
@@ -19,6 +19,6 @@ namespace VeterinaryClinicContracts.BusinessLogicsContracts
 
         bool Update(VisitBindingModel model);
 
-        bool Delete(VaccinationBindingModel model);
+        bool Delete(VisitBindingModel model);
     }
 }