A couple of bumbling burglars are mistaken as two aliens by a talking cat that watches too many conspiracy videos. Regardless it's up to Ms. Whiskers and her rat friend, Chuck, to capture them and save Christmas.
There's no actual dog in the movie, but Wally has a comedic flashback about not being able to save a dog. It's just audio of a dog barking and then a bomb going off and a dog whining. It's unclear what actually happened to the dog but he's upset about it.