I have been lucky enough to camp next to a few Dobies as we traveled - in every case, they were exceptionally-trained. Arrived once to see two sitting loose on the patio rug with their owner, and thought "uh-oh". Before we even set up, I went over, introduced myself, admitted that we had an idiot, rescued Cattle Dog with a really bad attitude towards big dark-colored dogs. The owner laughed, said he understood, said his dogs are trained to not leave the patio rug. I kept my idiot dog from seeing the Dobies, and we had a great weekend!
Th Trailer Life campground guide book used to tell what campgrounds had pet restrictions; either (B) breed, (S) size, or (N) number. The OP will have to watch for the (B) parks, but aside from that - happy camping! And on the "plus" side - Dobies are one of those breeds that people ususally don't send their kids, en masse, to "go over and pet". At least you won't become the campground babysitter.....LOL!