A Rottendoodle is a kind of dog, most of which act like their Grouch owners. The name "Rottendoodle" is most likely a combination of the dog names "Rottweiler" and "Poodle".
Itchy, unlike Oscar's dog, Cranky is a proper grouchy pet. He's dirty, & he doesn't do anything that Grundgetta tells him to do.
Cranky, unlike Grundgetta's Rottendoodle, Itchy, is helpful, polite, & loving. Thinking that Cranky's sick, Oscar brings her to Gina for veterinary advice. Gina helps Oscar to accept her for who she is: a sweet, playful, & annoying pet.