Have you even actually met the dogs. It's fairly common for dogs to act like they want to tear you arm off, then they come up and lick you. My dogs both do that. Neither one of them would hurt a fly, but if they're in the house or the fence and somebody's walking around the yard, you'd think they would murder you and they'll chase you down too, but they won't bite or harm a soul. 99% of the time, what the dog does is a direction of what the human does. take off running, expect to be chased. Maybe ask if you can meet the dogs, or verify if they would hurt you? That's the way to keep the customer rather than assuming these things are man eaters.