It's Pluto's birthday party, but Mickey's dozen or so nephews seem to be having all the fun. Their present is a wagon so Pluto can pull them; the "Pin the Tail on Pluto" game doesn't go quite right, and everything seems to prevent Pluto from having his birthday cake. But Mickey has planned ahead.

The presence of a couple of guinea pigs at the Westcote railroad station create countless offspring as well as a load of paperwork for administrative bureaucrats including by-the-book agent Flannery when their owner won't pay the rate for standard pigs on them. Adapted from Ellis Parker Butler's story, this is one of the oddest shorts on the set, but it is certainly entertaining with its fast-paced, rhyming Irish-jig-like music.