More on camping with pets
During my last camping trip, I found a dog wandering around about 100 yards away from the campsites. It was by itself on the beach. I picked it up, walked around the campground, found the campsite with the dog play toys and returned it to its owner. He was inside his RV and hadn't realized that the dog had gotten away. Even if that dog had an implanted chip, it would be difficult to figure out where it belonged that particular day using it. It's also not likely that a scanner for that chip would be located anywhere near the state park.
I realized today that this might have helped in that situation: a luggage tag (or something similar that you could write on) on the dog's collar that said, "I'm with the _____ family and we're staying at campsite #______ until ______. Our cell phone number is ________. Even if the owner somehow accidently left without the pet, having the name, date and cell number on the tag would allow park rangers to easily trace and contact who was staying there at the time.