#6 Boston Terrier
The Boston Terrier is an extremely expressive dog breed originally from the United States. It is compactly built with short tail and well proportioned, erect ears. The breed is gentle, friendly and generally happy, as long as the owner offers him enough affection. Extremely protective, the Boston Terrier may develop an aggressive behavior if he is not provided with the right training. Originally bred for hunting rats in factories, this adorable breed is gentle, creative, and well-mannered.