Am I the only one bothered by a pet charge at RV parks?

I think it is reasonable to charge extra for dogs. Dogs have to do their business all over their property, and let's be realistic, many folks do not clean up after their dogs. We have a dog and always find messes other owners have left. It's usually just a dollar or two extra a day...we have no problem paying it. So far it's just a few parks, but I suspect more and more will start doing it.