Taking a large dog to Utah State Parks
The rule is steady across parks: a leash of six feet or less, at all times.

The system-wide rule
Utah State Parks policies and park rules say pets are welcome at most parks and must be kept on a maximum six-foot leash at all times and not left unattended. Pets are allowed in cabins or yurts at most parks, with fees for lodging, and Deer Creek State Park prohibits dogs below the high water line and on the reservoir.
Park examples
The Dead Horse Point State Park pet page requires leashes at all times, even in the campground, and does not allow pets in its Wingate Yurts. The Snow Canyon State Park page caps leashes at six feet. The Antelope Island State Park brochure says dogs must be on a leash of six feet at most at all times.
Cabin fees
The Fremont Indian State Park facilities page lists a $20 per pet per night cabin fee at that park. Fees vary by park, so check before booking.
What it says about the dog
A six-foot leash at all times suits a dog that stays near you without pulling. Ask any provider to show you the dog working calmly beside a handler past strangers and other dogs.
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