one of my riding mates takes his dog everywhere we go, and that includes trail centres. The dog is well disciplined, stays out of the way and won’t be found getting in the way. I’ve had it run right alongside me with absolutely no fuss whatsoever.
Admittedly we don’t do downhills – that would just be foolish. I even look twice before crossing one, but to ban dogs altogether is a bit much. It’s all a bit, as i said before, like “golf course mentality”, which you lot seem to have;
“he’s not wearing the right clothes, so he’s not allowed on my golf course trail centre”
“no dogs allowed”