Actually, the dog could have Rabies and not look sick yet. You can’t tell just from looking! Having said that, Skid, I don’t really think you have anything to worry about. Rabies is very uncommon, esp. in dogs and cats, because most of them are vaccinated so regularly. I would recommend either a proof of Rabies vaccination within the past 3 years for the dog, or you should insist upon a 10-day quarantine, just to be safe.