The two Rabbit Sisters come to share the joys of Christmas with Mamma and Pappa.

Although Arthur the platypus has a terrible time remembering everything from his hat to the names of the oceans, he finds that there are some important things in his life which he can remember.

Henry and his big dog Mudge have many adventures together - walking in the woods in fall and admiring the colors, listening to Halloween tales, and having a Thanksgiving guest, Aunt Sally.

Although Henry's cousin Annie likes his dog Mudge, when she gets her own pet she decides that a bunny will be perfect for her.

Henry and Mudge the dog's boring weekend becomes interesting when Mom suggests building a castle in the basement.

Henry worries about what will happen to his big dog Mudge during their visit to his grandmother's house in the country. Spending the night at grandmother's house, Henry and Mudge help each other through a scary nighttime adventure when a collection of unfamiliar sounds keeps them awake.

At first Henry's very neat cousin doesn't like the cookies from under his bed or Mudge's slobbery kisses, but when they all play frisbee, she begins to enjoy her visit. Best friends Henry and Mudge have a difficult time winning over Henry's cousin Annie, until they discover that Annie shares their love of frisbee.

When Mudge gets sick unexpectedly, Henry does all he can to make him feel better.

In the not-so-pretty house where she lives with her dad and bunny Snowball, Annie plans to make some changes in the decor with the help of her next-door neighbor and cousin Henry and his big dog Mudge.

Henry, feeling lonely on a street without any other children, finds companionship and love in a big dog named Mudge.