Peg is the wife of Pete and the mother of P.J. and Pistol. She apparently married Pete sometime after Goofy moved away from Spoonerville, and works as a real-estate agent. During the series, she is often seen trying to reign in Pete's worse traits. She is shown to be quite cynical and overbearing in regards to Pete, but treats her children much better than he does.
Most of Peg's appearances on the show put her in opposition to Pete, often through Pete's mishandling of money and/or treatment of their children. When Pete is in a conflict with Goofy, she is often seen taking Goofy's side. In "Peg o' the Jungle," Peg, along with Goofy, Max, Pistol, and P.J teaches Pete to be more sensitive when Pete forgets their wedding anniversary. According to Peg, Pete used to be a much more attentive husband when they first married. Pete eventually gets the message, via a scam to make Pete think he had to win Peg back from a bunch of tribal lookalikes.
Other appearances often feature her real-estate business, though it is never gone into detail.
For reasons that are unknown, neither Peg nor Pistol appear in the films, despite being important characters in Goof Troop. A common fan theory suggests that Peg and Pete got divorced between the end of the series and the first film, and Peg has taken Pistol with her.
As seen in "Wrecks, Lies & Videotape," Peg might have taken acting classes in college when she agrees to help Max get even with Pete for stealing Goofy's vacation. She dresses as an over-worked, under-payed maid and gives a very melodramatic performance and even fakes crying.
Her name is a play on Pete's name from the original Mickey cartoons, Peg Leg Pete.