What Breed Is My Dog?

I have had my dog for 2 years, ever since he was a puppy. Nobody wanted to take him because he was abandoned by his owners, so we kept him instead. I'm always wondering what breed he is until now. He's very protective, he barks whenever there are people who pass by our house. He's really intelligent too, he knows how to open doors now, and he's very mischievous, but he's really friendly and a loving dog.

By Lillian