Mister Penny's race horse.

"You mustn't feel bad because you are not going to the fair," Mr. Penny said to Limpy, his faithful old horse. "You know about judges. They won't look at old fellows like us. But without you we wouldn't have any garden at all. And without you to pull the cart we couldn't get our things to the fairgrounds."
But Limpy was sad. He thought the bandage on his lame leg made him look like a race horse, and, more than anything else, he wanted to run on the race track.