Three's Company - Season 1 - Eps 4: No Children, No Dogs
Larry Dallas, a slick car salesman, unloads a puppy on the trio. Knowing that Stanley doesn't allow pets, they try to hide it. The puppy is necesary for Chrissy's sleepwalking problem.
About Three's Company

Title: Three's Company
First Air Date: 1977-03-15
Last Air Date: 1984-09-18
Status: Ended
Rating: 7.7/10 (from 160 votes)
Language: EN
Seasons: 9
Total Episodes: 171
Network: ABC
Genres: Comedy
Production Companies: Unknown
Synopsis
When two single girls, Janet and Chrissy, need a roommate to share their Santa Monica apartment, they decide to offer a room to Jack, a man they find passed out in the bathtub after the going-away party for their last roommate. However, hijinks ensure when Jack must pretend to be gay in order to throw off the scent of the trio's conservative landlady.
Cast

John Ritter
Jack Tripper

Joyce DeWitt
Janet Wood

Priscilla Barnes
Terri Alden

Don Knotts
Ralph Furley

Richard Kline
Larry Dallas