Tucker Mouse was waiting impatiently in the drainpipe in the Times Square subway station where he and his friend, Harry Cat, made their home.  And when Harry finally came home, he was dragging with him what looked like a dirty dish mop.  It was a puppy.
"It's staying for supper?" asked Tucker incredulously.
Huppy was to stay a good deal longer than that, and Tucker and Harry were kept busy seeing to the needs of their new pet.  As their fondness for Huppy grew, so did the dog, until the day came when he no longer fitted into the drainpipe.  A new home had to be found for him-but where?  Surely not with Max, leader of the Bryant Park pack of strays!  If only Miss Catherine, the high-toned Siamese cat of Mr. Smedley, the music teacher, could be persuaded to accept an addition to the family . ..