I am rehabbing two brothers, about 7 weeks old. Just noticed one scooting around the cage on his butt. He is eating and drinking normally. Playing and sleeping as expected. He did happen to notice my cat laying in the other room and acted all tough- making noise and jumping towards kitty. Wondering if this could this be his way of marking territory... or is he too young for that behaviour? Could he have an infection or worms? I’ve had these little sweeties for about two weeks now. First time I’ve noticed him doing this, but I’m worried. Please help?