Annie and her pet rabbit, Snowball, invite Henry and Mudge to a dress-up birthday party, but there is some confusion about what the guests are supposed to wear.
Henry and his big dog Mudge celebrate Henry's birthday with a piñata, a lively birthday party, and a cake shaped like a fish tank, making May first the best day ever.
When Mr. Putter and Tabby take Mrs. Teaberry to the Conservatory for her birthday, Zeke tries his best to stay out of trouble, but one of the trees is irresistible.