She briefly appears at the beginning when Tramp rescues her and Bull, a bulldog, from the dogcatcher. Peg later appears in the movie after Lady is captured by the dogcatcher and taken to the pound. When the other dogs start to pick on Lady, Peg, who has been captured yet again by the dogcatcher despite Tramp's rescue, steps in and tells them to stop. She easily comforts Lady, especially when one dog makes a comment about her license.
Peg also makes another cameo in Oliver & Company. During the song "Why Should I Worry", Peg is seen on the streets along with Jock and Trusty listening to Dodger sing. She also has an owner in the movie, implying that she was eventually adopted.