Young Mariah Carey wishes for a puppy in time for Christmas.

The film centers on young Mariah, a little girl who dreams of getting a dog for Christmas year after year. This Christmas her dream is fueled 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.