She looks too big for it, unless it was a few generations ago, but she looks part Boston Terrier, what with the black/white fur and markings, and the bat ears.
whatever she is, she's adorable. I got her a few years ago, because my mom showed me a video on Facebook and someone needed to get rid of her for medical reasons, and after about 2 months of endless begging, me and my dad got her. her name back then was Lily :D