What Breed Is My Dog?

I have had my dog, Romeo, since he was 8 weeks old. Now he will be 1 year old next month and everybody has been asking me what breed he is and I don't know what to say. I have told them that he is an unknown breed. The guy that I got him off of said that he was a Chihuahua and Boston Terrier mix, but I am not sure that is what he is.

As you can see he has brown, white, and grey fur. His little ears stick up whenever he hears a noise. Also on his ears he has little white hairs on the very tip. He has a long tail and he also has a good sense of smell. He has a beard. Can some one please help me?

By Tara A.