Henry's family takes in a stray cat, the ugliest cat they have ever seen, and an amazing relationship blossoms between it and their big dog Mudge.

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

Henry worries about what will happen to his big dog Mudge during their visit to his grandmother's house in the country.

After eight weeks at Papp's Dog School, Henry's dog Mudge earns a certificate and lots of liver treats.

Henry and his big dog Mudge celebrate Henry's birthday with a pi~nata, a lively birthday party, and a cake shaped like a fish tank, making May first the best day ever.

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

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.

Young Abe Lincoln is all dressed up in his best suit and on his way to deliver an important speech. As he walks along, he finds a pig stuck in a mudhole. Abe hates to see any animal suffer. If he helps the pig, his clothes will get muddy. What would people think of a mud-covered speaker? Abe doesn't want to leave the pig stranded, but he has no other nice clothes to wear. So, he continues down the road toward town, feeling guilty. He knows a pig isn't...

While Henry's parents are at a Sweetheart Dance on Valentine's Day, he and his dog Mudge have a wonderful time staying at Mrs. Hopper's house, where they enjoy tea and music and dressing up in various costumes.

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