Leaving dog at campsite

I have found that many dogs do bark when left alone. One time in Ohio there were two dogs, one on both sides of us that barked for hours while their owners were gone. I finally went to the office and complained. The owners were at one of the campers before I could walk back and luckily one of the dogs owners just got back. They were told they could not leave the dog unattended. They said their dog does not bark, but the CG owners had heard it barking. The people wanted to leave again without the dog but we're told that was not an option.
Another time in Alaska a dog barked for hours and hours. Most dog owners may not believe it but there are times that their dogs do bark when left alone.
That is why we do not have a dog. It is not fair to the dog nor to the other campers left to hear the barking. Just my humble opinion.