Davis Cleveland

When a family visits Grandma's house on Christmas Eve, they leave their dog at home alone. And when burglars try to take the presents from under the tree, the dog must use every trick it knows to stop them.

Rufus is a dog but turns into a human with a pendant. He meets a girl named Kat who asks him to go out. Kat is a cat who can also turn into a human as well. (imdb)