Family Guy - Season 7 - Eps 5: The Man with Two Brians
Eight-year-old Brian (who is 56 in dog years) seems to have lost a step or two, so Peter gets a new talking dog, New Brian, to "take some of the load off" the old one, who doesn't like the idea at all.
About Family Guy

Title: Family Guy
First Air Date: 1999-01-31
Last Air Date: 2025-03-09
Status: Returning Series
Rating: 7.4/10 (from 4500 votes)
Language: EN
Seasons: 24
Total Episodes: 430
Network: FOX
Genres: Animation, Comedy
Production Companies: 20th Century Fox Television, Fuzzy Door Productions, 20th Television Animation, 20th Television
Synopsis
Sick, twisted, politically incorrect and Freakin' Sweet animated series featuring the adventures of the dysfunctional Griffin family. Bumbling Peter and long-suffering Lois have three kids. Stewie (a brilliant but sadistic baby bent on killing his mother and taking over the world), Meg (the oldest, and is the most unpopular girl in town) and Chris (the middle kid, he's not very bright but has a passion for movies). The final member of the family is Brian - a talking dog and much more than a pet, he keeps Stewie in check whilst sipping Martinis and sorting through his own life issues.
Cast

Seth MacFarlane
Peter Griffin / Brian Griffin / Stewie Griffin / Glenn Quagmire / Tom Tucker (voice)

Alex Borstein
Lois Griffin / Tricia Takanawa / Loretta Brown / Barbara Pewterschmidt (voice)

Mila Kunis
Meg Griffin (voice)

Seth Green
Chris Griffin (voice)

Patrick Warburton
Joe Swanson (voice)

Arif Zahir
Cleveland Brown (voice)