I have not read the whole thread. I did read the first post. It toiok me awhile to condense my thgouhts, and I hope it's not too late to share a possibly-cogent thought.

My first reaction was, why don't campground rules cover this? At US campgrounds, there is no exception to the rule that dogs must be short-leashed whenever they are outside the RV, tent, or cabin. They can't be left unattended (tied out or in the campsite), either. Campground personnel can evict an owner who does not observe this, or any owner whose dog is not under control, or campers whose dogs bark excessively or violate the quiet-after-bedtime rules. I believe proof of rabies vaccination is required at registration.

Can't that just be Festival Policy and enforced by stewards?

~S~