Panini's Best Friend is a Chowder (TV series) story featured in issue #57 of Cartoon Network Block Party. The plot revolves around Chowder being mistaken for a wild animal and being caught by animal control. Panini discovers this and adopts Chowder as her pet in order to have him forever.
The issue was released in the July of 2009.
Due to a food-related mishap, Chowder is captured by the Marzipan City animal control and put in the pound. Panini retrieves him, but insists that he is now her pet.