That's hilarious! When I had Heidi, my border collie, she slept on a big sheepskin rug, until my calico Puddy came along, that is. Sweet Heidi was so accommodating but that wasn't enough for Miss Puddy. She wanted it all to herself and when she couldn't have it, she decided to hop up on Heidi's back and that's where she slept. It was an arrangement that worked out well until the temptation to play w/Heidi's tail was too much, then Heidi shook Puddy off. I wish I had a picture of that because the pic of your Finnegan and Casey is priceless!