I just ignore the dogs when I vacuum, and if they bark they get told "Quiet" and if they lunge, they get told to leave the room. My puppy tries to start games with it, so ignoring him makes him give up and go play with something else. DH's dog was teased with it when she was a puppy (I know, don't get me started on that one, lol) so she does have an issue with it, but she's good at leaving the room. If either one of them were fiends about it, I'd just crate them. I've never used it for grooming, but desensitizing would probably be better that forcing it on them, if they're actually petrified of the thing.