My Lil'Bear goes by Bear to most people, but my one granddaughter has always called him "Bear Bear" ... and he always has responded to that so quickly ...... So if I need him to do something, in a syrupy sweet voice, I call Bear Bear, and he comes running. .. go figure!
Boo-Boo, yes! .... My yellow lab was named Boudreaux, (Cajun name) but always called Boo. ...
Like my little dog Bear, Boo acquired the double name of Boo-Boo most of the time. But with him, he always answered to any name!
It seems like all out pets had nicknames. Ginger was Ginny, Pepper was shortened to Pep,Bumper was shortened to Bump and Scooter was Scoot. My first dog was named Toby who my Dad always called Gus,my Mom and I called him woo woo.
Our guinea pig was named Nibbles we all called him piggy.
The bird I have now came with the name Kerby but we call him poop.