Mariah Carey's All I Want for Christmas Is You

The film centers on young Mariah, a little girl who dreams of getting a dog for Christmas after seeing a puppy named Princess at the local pet store. To see if she's ready for the responsibility, Mariah is tasked with dog-sitting her uncle's crazy canine Jack, who upends the family's holiday preparations with his various shenanigans.
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!