Meat Cleaverin' Nutritionist has become a vet...oh no...wait...Pete actually drew a pocket. He also drew a Celtic Cross on a clipboard...and Marmaduke on the wall (Heathcliff/and Marmaduke/what a wacky pair!) So...

Heathcliff is pregnant and is about to beat the piss out of his vet for insinuating that it makes him look like a tuba, even though tubas, having the most curves and the most convenient hole, are the sexist of instruments.