diff --git a/backend/src/main/java/com/petshop/backend/service/AppointmentService.java b/backend/src/main/java/com/petshop/backend/service/AppointmentService.java
index 9abcf831..ef5f9cdb 100644
--- a/backend/src/main/java/com/petshop/backend/service/AppointmentService.java
+++ b/backend/src/main/java/com/petshop/backend/service/AppointmentService.java
@@ -169,6 +169,7 @@ public class AppointmentService {
     }
 
     @Transactional(readOnly = true)
+
     public List<String> checkAvailability(Long storeId, Long serviceId, LocalDate date) {
         storeRepository.findById(storeId)
                 .orElseThrow(() -> new ResourceNotFoundException("Store not found with id: " + storeId));
@@ -176,7 +177,16 @@ public class AppointmentService {
         com.petshop.backend.entity.Service service = serviceRepository.findById(serviceId)
                 .orElseThrow(() -> new ResourceNotFoundException("Service not found with id: " + serviceId));
 
-        List<Appointment> existingAppointments = appointmentRepository.findByStoreAndDate(storeId, date);
+
+        //--------------------------------------------------------------------------
+        // CHANGED: filter by serviceId too
+        List<Appointment> existingAppointments = appointmentRepository
+                .findByStoreAndDate(storeId, date)
+                .stream()
+                .filter(a -> a.getService().getServiceId().equals(serviceId))
+                .collect(Collectors.toList());
+       // -------------------------------------------------------
+
 
         List<String> availableSlots = new ArrayList<>();
         LocalTime startTime = LocalTime.of(9, 0);
@@ -240,13 +250,21 @@ public class AppointmentService {
         );
     }
 
+    //------------------------------------
     private void validateAvailability(StoreLocation store, com.petshop.backend.entity.Service service, LocalDate date, LocalTime time, Long appointmentIdToIgnore) {
-        List<Appointment> existingAppointments = appointmentRepository.findByStoreAndDate(store.getStoreId(), date);
+        // Filter by same service only - different services can run at same time
+        List<Appointment> existingAppointments = appointmentRepository
+                .findByStoreAndDate(store.getStoreId(), date)
+                .stream()
+                .filter(a -> a.getService().getServiceId().equals(service.getServiceId()))
+                .collect(Collectors.toList());
         if (!isSlotAvailable(existingAppointments, service, time, appointmentIdToIgnore)) {
             throw new IllegalArgumentException("Appointment time is not available for the selected store and service");
         }
     }
 
+    //------------------------------------------------
+
     private boolean isSlotAvailable(List<Appointment> existingAppointments, com.petshop.backend.entity.Service requestedService, LocalTime requestedStart, Long appointmentIdToIgnore) {
         LocalTime requestedEnd = requestedStart.plusMinutes(requestedService.getServiceDuration());
         for (Appointment existingAppointment : existingAppointments) {