A hermit crab who has outgrown his old shell moves into a new one, which he decorates and enhances with the various sea creatures he meets in his travels.

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

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.

By order of the Duke, Walter the Baker must invent a tasty roll through which the rising sun can shine three times.

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

Pinky learns the importance of identity as he defends his favorite color, pink, and his friendship with a girl, Rex, from the neighborhood bully.

Rex and her best friend Pinky are upset to learn that their friend and neighbor Mrs. Morgan is moving, and it looks like a family with an obnoxious boy named Ollie is set to move in.

While trying out the spy glasses, spy hat, and other items in their new spy kit, seven-year-old Henry and his dog Mudge make a new friend and form a spy club.

Henry, his dog Mudge, and his parents go on a quiet camping trip to Big Bear Lake, enjoying the clean smell of trees and wonderful green dreams.

Although his best friend Rex is excited about going to camp, Pinky is afraid of leaving home.