The Mystery of Mr. E (American Girl: Welliewishers)

There's a new friend in the garden -- a big, shaggy dog with the mysterious name of Mr. E! The dog loves to play, so when he suddenly disappears, the WellieWishers are worried. They search high and low and find paw prints, but no dog. What has happened to Mr. E? The WellieWishers are about to get the surprise of their lives!