Zipper's distinctive smile appears to have no impact on her. She eats regularly and enjoys rewards, and she appears to be unaware that she is unusual.

Erin Webb, a volunteer with Huntsville Animal Services, told The Dodo: We don't know what caused the jaw [malf.ormation]. We have no idea what caused it. She does have a big [und.erbite] and her teeth are pretty far apart.