Tater and Scooter often embrace each other when they nap. They'll wash each other's head and then that generally devolves into a fight....and after a while they go back to snuggling again. Not all that different from their human counterparts.
@terryliv Actually they pretty much share the role of initiator. Tater's reputation does precede him of course, but he's actually the initiator of the tongue bath more often.