Plump, short-legged Daisy loves to snuggle up with toys and a blanket, cuddle in Mom's lap, or even ride in a stroller or sit in the high chair, all to the consternation of the real baby- -Daisy is a dog. But Mother Nature herself comes up with a role reversal that suits both to a T: ``Daisy can't be a baby anymore...Because Daisy is a mommy!'' In Kopper's color pencil illustrations, the by-play between between ingratiating canine and aggrieved tot is observed in wonderfully comical and lifelike detail; the very young will delight in the incongruity of the dog engaging in their own activities. A charming little story that children can discuss or retell with the help of two series of endpaper vignettes showing additional sequential scenes. (Picture book. 3-7)