Here’s the official synopsis and teaser trailer:
When young Mariah (voiced by Breanna Yde) 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 pet-sit Jack, a scraggly rascal of a dog; in fact, the worst dog in the county! Naughty Jack turns Mariah and her family’s Christmas preparations upside down in hilarious ways. Will Jack dash Mariah’s hopes for her dream puppy? Or will Christmas reveal how love works in surprising and mysterious ways?