Add Dog schema

schemas/dog.py

@@ -0,0 +1,28 @@
+from pydantic import BaseModel, Field
+from typing import Optional
+
+# Base schema
+class DogBase(BaseModel):
+    name: str = Field(..., description="Name of the dog")
+    breed: str = Field(..., description="Breed of the dog")
+    age: int = Field(..., gt=0, description="Age of the dog in years")
+    owner_id: Optional[str] = Field(None, description="ID of the owner (foreign key)")
+
+# Schema for creating a new Dog
+class DogCreate(DogBase):
+    pass
+
+# Schema for Dog responses
+class Dog(DogBase):
+    id: int
+
+    class Config:
+        orm_mode = True
+        schema_extra = {
+            "example": {
+                "name": "Buddy",
+                "breed": "Labrador",
+                "age": 5,
+                "owner_id": "user123"
+            }
+        }