Nicknames for dog named Piper?

We got a pitbull puppy from my uncle (he's a breeder) and they had been calling her Piper and that's what's on her papers. I don't really like piper as a name. I was thinking about nick names like peter piper 'petey' but petey is a boy name. any suggestions? Oh and my little cousin chose piper so i don't want to change it, nor do i know if you even could, on her papers.