When Janie finds the leash and collar that belonged to Rupert—a paragon of a dog who died five years ago when she was two—her parents make it clear that they're not about to replace him: only another Great Dane would do, and they're far too expensive. Janie, a sensible lass whose persistence and imagination much resemble King-Smith's Sophie's, wastes no time in argument; instead, she declares the existence of an invisible Great Dane, gets her dad involved in naming him Henry, walks him around on the old leash, and makes friends with an elderly neighbor who accepts Henry's existence with a good-humored common sense that mirrors Janie's own. In the end, a real dog is found; just as her parents are beginning to come round anyhow, Janie gets an unexpected bequest, and they find a half-grown pup with a tiny kink in his tail that gives him a bargain price. A minor effort from this reliable author, but told in his usual refreshingly brisk style and set forth in attractive, easy- looking format. (Young reader. 7-10)