The episode is called Not All Dogs Go to Heaven (Season 7, episode 11 if you need to know.)
the 100 episode was stewie kills Lois now the next one is Lois kills stewie
This happens in Stewie Griffin: The Untold Story.Specifically it's the episode, Bango Was His Name-O
Stew-Roids
the episode name is Stewie B. Goode which is Season 4 Ep. 28 Also the first part the Stewie Griffin: The Untold Story
That would be Stewie Griffin: The Untold Story
Season Five | Episode One | Stewie Loves Lois
Stewie Loves Lois
Love thy trophy
It is called "Road to Rhode Island"
Season 6 Episode 5: Lois Kills Stewie
There are three episodes the first is Red carpet premiere and opening,Stewie B. Goode and Bango Was His Name, Oh!
Stewie Griffen the untold story