when they come in w/ their people.
(I don't. I know better. that and I happen to know that this is a hearing-ear dog; conversations with his person are inconvieient for the guy--I'd have to pass him a 'can I pet your dog please?' note. Our conversations are always on a pad of paper :-P)
Although I wonder WTF we do if he ever wants to take a lab. class-I can imagine the dog in goggles and a lab coat