Add Dog schema

schemas/dog.py

@@ -0,0 +1,27 @@
+from pydantic import BaseModel, Field
+from typing import Optional
+
+class DogBase(BaseModel):
+    name: str = Field(..., description="Dog's name")
+    breed: str = Field(..., description="Dog's breed")
+    age: int = Field(..., gt=0, description="Dog's age in years")
+    owner_id: Optional[str] = Field(None, description="ID of the dog's owner")
+
+    class Config:
+        schema_extra = {
+            "example": {
+                "name": "Buddy",
+                "breed": "Labrador",
+                "age": 5,
+                "owner_id": "123e4567-e89b-12d3-a456-426614174000"
+            }
+        }
+
+class DogCreate(DogBase):
+    pass
+
+class DogResponse(DogBase):
+    id: int
+
+    class Config:
+        orm_mode = True