Most of the time, Sirius is pretty good about acting like a normal dog. But there are the times when he slips up, or forgets. Usually when it comes to conversation than anything else. There's just too much of a desire to reply.

So when he's approached with a bowl of water, Sirius pulls the usual dog act, panting and wagging his tail appreciatively. He slurps the water eagerly, making a little mess but not a big one. Although when Eames asks his question, he receives a look that seems to say "tell me about it."