S5·E52 Kitty Conundrum

Caillou finds a tiny kitten while desperately searching for his beloved Rexy. He wants to keep the kitten, even though Mommy and Daddy say no they have Gilbert! When Samantha comes to the door to claim her lost kitten, Whiskers, Caillou fetches the kitty... and finds Rexy! He remembers it isnt fun losing something you care about, and happily returns the kitty to its rightful owner.