We keep an array of cardboard boxes around the house for Boo to sleep in, while he has his favorites he likes to mix things up from time to time. I’m not sure he knew what to make of Sam suddenly deciding to take over the box from my latest REI delivery but it has become one of his favorite places to sleep (when not curled up on one of us). I saw Boo one day just watching Sam sleeping, I couldn’t tell if he was delighted that his older brother was taking after him, annoyed at the loss of one of his box choices, or a little of both.