Heathcliff and the Catillac Cats - Season 1 - Eps 39: Hospital Heathcliff
Iggy goes into a hospital to have his tonsils removed, and Heathcliff goes along - even though no pets were allowed. Heathcliff terrorizes the hospital in a very short time, and even gives a lecture posing as a visiting doctor.
About Heathcliff and the Catillac Cats

Title: Heathcliff and the Catillac Cats
First Air Date: 1984-09-17
Last Air Date: 1985-10-07
Status: Ended
Rating: 6.3/10 (from 48 votes)
Language: EN
Seasons: 2
Total Episodes: 172
Network: Syndication FR3
Genres: Animation, Comedy, Kids
Production Companies: ICC TV Productions, DIC, DiC Entertainment
Cast

Mel Blanc
Heathcliff (voice)

Donna Christie
Cleo / Iggy (voice)

Peter Cullen
Pop / Max (voice)

Jeannie Elias
Jeannie Elias (voice)

Danny Mann
Hector (voice)

Marilyn Lightstone
Sonja (voice)