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As you can probably gather from the dialogue in this strip, Big Sister and the boys found a lost puppy at Christmas and decided to keep him, but Father thinks it's best to return him to his owners. The idea that the puppy was actually a gift from Santa may make sense to a kid, but I'm not sure how the logistics would work. Santa having a bunch of toys and candy and whatnot in his giant, magic bag is fine, but I'm sure it would get weird as soon as he started stuffing live animals in there. It's a magic bag, sure, but I just don't think they would be comfortable. And would he have to feed them along the way? There are too many questions. So, for those who have kids, if you get them a pet for Christmas, avoid the questions and don't tell them it came from Santa (and realize that what you've actually done is buy yourself a pet for Christmas).