Earl E wrote:
Other have explained it well. Your dog may be very docile, gentle and quiet. But if they let yours in they have to let the non-gentle, vicious 100# in that the next camper has. And that dog can do far more damage than a 20# dog. It is just the way it is. Rules have to be made for everyone. No way can a receptionist at the desk decide which dog is gentle and which isn't.
No, they do NOT "have to" let a vicious dog in. "They" have a perfect right to insist that all dogs are social with people and other dogs, and to see those dogs before they come in.
As for deciding which dogs are "gentle" and which are not, I'm not sure when that became a highly technical task. It requires eyes, ears, and common sense. Nothing more.