My Siberian Husky is a talker, he doesn't bark like normal dogs but he does try to participate in conversation. I'm hyper-sensitive to his potential impact on our neighbors and if he's having a conversation with a squirrel that I think is getting out of hand, I step in.
My first course of action if I had an unreasonably loud pet in the spot next to me would be to talk to them. "Is there anything you can do about your dog? It's all we can hear over here".
If that isn't an option, take it to the camp host if you have one, or call the ranger station. I have been compelled to call the police more than once, but that is very rare and usually involves illegal and dangerous (to us) activity when it has happened... i.e. wasted on booze, building bonfires in a small fire ring, dancing around with loaded shotguns while yelling like drunks do kind of stuff) I always try to go with option 1 first because depending on how long you are staying in that spot, you'll have to deal with their presence for a while. Getting anything resembling law enforcement involved and it just makes things a little more tense than usual.
If the dog is barking because something is potentially wrong with it... i.e. they tied it up to the picnic table and left for the day, I go immediately to option 2. No tolerance for bad pet owners.
My problems in a tight campgrounds are usually related to excessively loud humans, their generators, music etc... I like dogs more than most people though, so that might explain some of it. As luck would have it, the same 2 options apply for them.
2016 27BHS Elite
2012 F-150 EcoBoost / Max Tow