Because why not? Since Stretch-O-Mutt here can shape-shift like Plastic Man can (as he's basically a dog version of him anyways).
Seems like he took up a new job. Perhaps he's doing an Amazon delivery or something. Or maybe he became an actual blimp just for fun.
I really love doing rubbery TF art like this. Perhaps I'll draw him as a MASSIVE bounce house for a party or something next.
Character from Krypto The SuperDog (c) DC Universe, Warner Bros. & Cartoon Network.