When young Mariah sees a darling little puppy named "Princess" at the pet store, she suddenly knows exactly what she wants for Christmas. But before her Christmas wish can come true, she must prove that she can dog-sit her uncle's dog, Jack, a scraggly rascal; in fact, the worst dog in the county!

When young Mariah sees a darling little puppy named "Princess" at the pet store, she suddenly knows exactly what she wants for Christmas. But before her Christmas wish can come true, she must prove that she can dog-sit her uncle's dog, Jack, a scraggly rascal; in fact, the worst dog in the county!