Whilst playing at being a «acrobatic dog» with Anthony and Bobby, Woofy climbs on the swing, loses his balance and falls on his head. When he gets up, he has lost his memory! Their little neighbour, Muriel, takes advantage of Woofy’s memory loss to make him believe that she is his mistress and brings him back to her house. However, the little girl quickly realises the difficulties of having a dog in the house…