We require pets to be on a leash when they are not in the RV. Do we look the other way when people are sitting outside with them? Yes. Do we allow fencing? No. Reasons: We are an RV park not a kenneling facility. If we wanted our sites to be fenced, we would fence them. A pet confined by a fence is not under anyone's control. They will evacuate their bowels and there will not be anyone there to clean it up. If a child wanders up to the dog, there is no one to assure their safety. And finally, I haven't seen too many portable fences that actually will confine a pet intent on going elsewhere. It is a false sense of security.