Every kid wants one, but few are as persistent and inventive about getting one or a substitute for one as little May. It seems to little May that everybody has a dog except her. She tries everything, even bringing one home, with no success. Then one day she accidentally discovers that a rollerskate can act like a dog, almost, so she works at acquiring the technical skill that will change it into one, almost. She leads it, walks it at first timidly, then boldly ties it up outside stores, takes it all the places a dog can go. In fact, she starts quite a fad on her street of rollerskate walking.