A couple of fourth-grade girls share projects, comic events, participation in a dog show, and the sorts of quarrels enjoyed by old friends. Co-publishers of a neighborhood newspaper, Maisie and Glenda retail a variety of embarrassing gossip which is received with surprising equanimity except by Maisie's teen-age brother, Lloyd, who prefaces every phrase with like, oppresses the family with ear-shattering music, and cultivates the kind of monumentally messy room we'd all rather laugh at than live with. On the advice of the paper's ""Dear Aunt Polly,"" Mom lets him keep it that way, with door shut, till she discovers that it's been exhibited to the younger children as a pig sty (which they mispronounce as pig's eye). Grand finale and funniest scene: klutzy, dim family dog wins prize for most intelligent when Maisie realizes she can make him seem obedient by anticipating his normally contrary behavior and telling him to do what he was going to do anyway. An entertaining romp, full of action and funny conversations, which should please Cleary fans; although Wolkoff's characters are less well drawn, they're lively, familiar types.