diff --git a/openapi_first/templates/vet_app/routes.py b/openapi_first/templates/vet_app/routes.py
index 2f75307..9804380 100644
--- a/openapi_first/templates/vet_app/routes.py
+++ b/openapi_first/templates/vet_app/routes.py
@@ -69,7 +69,7 @@ def list_parents(limit: int = 20, offset: int = 0):
         Paginated response with ``total`` and ``items``.
     """
     items = _list_parents()
-    return {"total": len(items), "items": items[offset:offset + limit]}
+    return {"total": len(items), "items": items[offset:offset + limit] if limit else items[offset:]}
 
 
 def create_parent(payload: ParentCreate, response: Response):
@@ -168,7 +168,7 @@ def delete_parent(id: int, response: Response):
 def list_vets(limit: int = 20, offset: int = 0):
     """List vets (paginated)."""
     items = _list_vets()
-    return {"total": len(items), "items": items[offset:offset + limit]}
+    return {"total": len(items), "items": items[offset:offset + limit] if limit else items[offset:]}
 
 
 def create_vet(payload: VetCreate, response: Response):
@@ -259,7 +259,7 @@ def delete_treatment(id: int, response: Response):
 def list_pets(limit: int = 20, offset: int = 0):
     """List pets (paginated)."""
     items = _list_pets()
-    return {"total": len(items), "items": items[offset:offset + limit]}
+    return {"total": len(items), "items": items[offset:offset + limit] if limit else items[offset:]}
 
 
 def create_pet(payload: PetCreate, response: Response):
@@ -330,7 +330,7 @@ def list_appointments(limit: int = 20, offset: int = 0, date: str = None, vet: i
     if pet is not None:
         items = [a for a in items if a.pet.id == pet]
 
-    return {"total": len(items), "items": items[offset:offset + limit]}
+    return {"total": len(items), "items": items[offset:offset + limit] if limit else items[offset:]}
 
 
 def create_appointment(payload: AppointmentCreate, response: Response):