Thread:Yetti01/@comment-1984959-20120507010259

The name "Prison Dog" is official. It appeared in the following:
 * The DVD pamphlet for AWE
 * Pirates of the Caribbean: The Complete Visual Guide
 * One of the versions of the official POTC website

"Poochie", however, was only a nickname given by Pintel(and Pintel only) in DMC.

Hope this helps! :) 