This isn't the worst Caillou book I read to my son, but it is not particularly interesting. The title isn't even accurate. The dog he walks is one his grandmother is dog-sitting, unless the title refers to the plush dog he pretends to walk at the end.
Not one of my favorites, but my son loves it. I hate his names for starters Ky-you, just, eh. It seemed like Caillou's name had to be in every sentence and that was annoying.