We don't have dogs or cats, but really like being able to pet and fawn over other peoples' dogs & cats. That way we don't have to clean up after them, feed them, or pay their vet bills. It's a win-win situation for us and the pet owners - they get to have a pet they love and we get to enjoy their pet for a few moments without any responsibility for them.
BTW, we have a beautiful grand dog and grand cat that we occasionally care for when our daughter is out of town.
In regard to the original post, very few times have we experienced noisy dogs in campgrounds without owners getting on the situation quickly. While at our FL campground we notice that on occasion there are some nasty sounding dog-on-dog interactions. And of course there's the lazy dog owners that "forget" to pick up after their dogs.