The issue of "dogs in camp" does bug me when someone lets their dog run loose to "visit" everyone. . .and it ends up peeing on other people's campsites, getting into their food, or just visiting people who don't really want to be visited by a strange, slobbering, wet, smelly dog that has manure-breath and rolled in some kind of dead animal on trail earlier that day.
Even if you bring your dogs to camp but not on trail, it's up to you to make sure they are not a nuisance to other campers. I've been on a number of trips where people brought their dogs and just tethered them to the trailer while they rode. What they didn't realize was that, from the time they rode out of camp until the time they returned, those dogs barked. At everything. At nothing. They just barked.
Then again. . .I don't really like feral children in campgrounds, either.
That's a whole other issue, though.
Don't misunderstand me - I LOVE dogs. I really miss having one of my own. My old Rottie was a fantastic trail dog because I took the time to train him and socialize him BEFORE just going out on trail and hoping he "behaved" himself.
If you choose to bring your dog with you, you HAVE to accept responsibility for it and you HAVE to remember that not everyone is a dog person. Not every horse/equine you meet on trail likes dogs, either.