When Caillou's shoes become too small for him, he must get new ones. But what kind will he get?

Caillou is playing dinosaur hunter with Gilbert the cat. Caillou goes for a snack, and when he comes back there's no sign of Gilbert. He's disappeared! Mom says Caillou will have to be a detective, so together they search the house for clues. Eventually they find Gilbert curled up fast asleep in Caillou's bed.