All dogs must be kept on a leash with a human attached at the other end. NPS photo. Phone: Outdoors with Pets. For the protection of your animal, visitors, and Saguaro National Park, pets are allowed only on roadways, picnic areas (except Mam-A-Gah picnic area in the Tucson Mountain District-west) and paved trails (Desert Ecology Trail & Desert Discovery Trail). Pets must be kept on a leash that does not exceed 6 feet at all times. Pets may not be taken on trails, off road, or inside both visitor centers. Pets may not be left unattended in or outside of a vehicle at any time.