Zeus a Labrador Retriever, and a former police dog (voiced by Mario López), has lost his bark after his barking ended up blowing off a five-year investigation and his partner can't shoot strait again and ends up at the pound. He is adopted by a father (played by Gary Valentine) as both an early Christmas present and as a good guard dog for the house, but the mom (played by Elisa Donovan) is hesitant and didn't want a dog. The dog is left alone on Christmas Eve when the family head off to visit Grandma's house. A pair of burglars (Dean Cain and Joey Diaz) break into the family home, and it is up to Zeus to save Christmas for his new family.