A disappointing early chapter book from a gifted humorist (the popular Bagthorpe books, etc). Posy, eight, yearns for a pet but makes do with ""creepy crawlies,"" like a pair of spiders she keeps in a jar and the fleas she hopes to find on a hedgehog she brings in from the garden. Her mother, preoccupied with baby Fred, wants none of them. There are some encounters with a hungry bag-lady before Posy throws a pet show that, as such, is a fiasco, but docs bring her a stray dog that ""Mom"" says she may keep. Posy, imaginative and in need of attention, is drawn adroitly but from a rather adult point of view and in an ironic style that's as thoroughly British as the fabric of Posy's life (in which context ""Mom"" is ludicrous); many American readers Posy's age will find her story hard to follow, its events fairly predictable. Still, readers who enjoy King-Smith's more engaging Sophie's Snail (1989), with its similar theme and audience, might also warm to Posy. Illustrations not seen.