Henry and his big dog Mudge try to keep busy inside the house during a thunderstorm.

Henry and his big dog Mudge attend their first family reunion.

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

In the winter Henry and his big dog Mudge play in the snow, share a family Christmas dinner, and gather around a crackling winter fireplace.

When Henry's cousin Annie prepares to move in next door, he and Mudge help calm her fears.

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

Henry is excited when his Uncle Jake builds him a tree house but worries that his dog Mudge will not be able to enjoy it with him.

For Henry and his big dog Mudge, summer means going on a picnic in the park, taking a bath under the garden hose, and going to the top of the big green hill.

Henry and his dog Mudge are invited to a sleepover in Patrick's attic, where they watch monster movies, eat pizza, and enjoy a contest to determine whose dog is the best popcorn catcher.

Henry, his parents, and his dog Mudge take a vacation out West, where they enjoy tumbleweeds, desert animals, souvenirs, and the wide open spaces.