Caillou and Dad go over to Mr. Hinkle’s house to help him build a dog house. Caillou soon meets Mr. Hinkle’s guests, a Mommy dog with her two puppies, who are staying with him for a few days. When one of the puppies disappears, Caillou helps look for him. Fortunately, the bold little puppy comes out of hiding and joins his family in their new home.