We recently camped for three nights at Dog Canyon. huachuca's picture represents well what the campground looks like. There are four back in RV slots available and the sites are rather close. There is water available in the campground, but not at the site and there are no hookups and no dump station; generator hours are 8AM to 8PM. There was no problem fitting my 30 foot fifth wheel into the site; longer trailers might stick out into the gravel road a bit, but the road is wide and traffic light so that probably is not much of an issue. I talked with the campground host, and he said that except for unusual situations the RV sites are not heavily used. There were two other RV's there during part of our visit. The campground was peaceful. There are two long hiking trails available at the trail head in the campground, as well as other hiking/sightseeing in the area.
This is not a campground you would end up at accidentally; it is over one hundred miles from the main NP campground at Pine Springs. The roads to Dog Canyon are OK. There is no fuel (gas or diesel) in the area at all, so fuel up before your trip. And as huachuca said, look out for kamikaze cows.
There's lots of advice and information in forums...
sometimes it is correct.
2011 Jayco 28.5RLS; 2008 Chevy 2500HD Crew Cab; Duramax/Allison; Pullrite 14k Superglide Hitch