Check before you go...just read on another forum where a guy was given a $100 citation while walking his dog on a leash, on a paved campground road.
Not sure how many National Parks are affected, Black Canyon in Gunnison, CO is one...
South Rim Campground and Rim Rock Trail Dog Restrictions
From June 1 to August 10, 2018, dogs will be allowed in campsites in South Rim Campground, but may not be taken on walks (even on leash) or be carried around the campground or on the southern portion of the Rim Rock Trail due to potentially aggressive deer protecting their fawns. Over the past few years, female deer have acted aggressively and even attacked park visitors walking dogs. The deer perceive the dog as a threat to their fawns. This has resulted in several deer being euthanized and a visitor almost getting mauled to death.
https://www.nps.gov/blca/planyourvisit/pets2.htm
Not sure how many National Parks are affected, Black Canyon in Gunnison, CO is one...
South Rim Campground and Rim Rock Trail Dog Restrictions
From June 1 to August 10, 2018, dogs will be allowed in campsites in South Rim Campground, but may not be taken on walks (even on leash) or be carried around the campground or on the southern portion of the Rim Rock Trail due to potentially aggressive deer protecting their fawns. Over the past few years, female deer have acted aggressively and even attacked park visitors walking dogs. The deer perceive the dog as a threat to their fawns. This has resulted in several deer being euthanized and a visitor almost getting mauled to death.
https://www.nps.gov/blca/planyourvisit/pets2.htm