This could be a wonderful sentiment for this dog, but only on a few conditions. You're not referring to a movie that I never saw. You are referring to the many enjoyable things a dog can love that comes in a box, like a new squeaky toy. You are not referring to the man in brown, who comes to the door, grrrrr to deliver boxes with that smiley face on them.
Instead of all that, this saying would have a lot of meaning if..