When I was little, my brothers and I were endlessly trying to sneak "new pets" into the house. There was the white, scruffy and possibly deaf cat we called Ivory (the sounds of endless yowling lead my mother to conclude he "must not be able to hear a damn thing.") And the big old Tom-cat who prowled our back porch; we once fed him raw hot dogs.
The largest animal we ever tried to make our own without asking our parents was probably a dog. The little girl in this video is much craftier. She snuck a cow in the house without her mom knowing. And the results are adorable.