The cat and dog got into a fight on the sun porch. They're on the sun porch because that's usually where the cat and dog get into fights. It must be Christmas time because there's a Christmas tree up. The sound of timber falling, they tipped the Christmas tree over. The cat and dog know they're in trouble because the dog's ears are back and the cat is hiding and trying to get away from the dog. No one must be home because nobody is in the picture. When the people come home and see the mess, they figure next time they leave they should tie them up. This is why cats and dogs belong in the barn.