Eleven-year-old Zelly Fried's parents will not allow her to have a slumber party until she teaches her mischievous puppy, Ace, to behave, but with Grandpa Ace around nothing is ever simple.

Fiona, a dog trainer who participates in canine search-and-rescue missions, is devastated after her fiancee is murdered, but her emotions are rekindled when Simon, a newcomer to town, brings his puppy Jaws to her for obedience training.

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