Service animals are allowed in all facilities and on all trails unless an area has been closed by the superintendent to protect park resources.
Definition of Service Animal
The 2010 revision to Title II of the Americans with Disabilities Act (ADA) defines a "service animal" as a dog that has been individually trained to do work or perform tasks for the benefit of an individual with a disability,including a physical, sensory, psychiatric, intellectual, or other mental disability.
Dogs that are not trained to perform tasks that mitigate the effects of a disability, including dogs that are used purely to provide comfort or emotional support ("therapy animals"), are considered pets.
Service animals in training and pets are subject to the park's pet regulations and are not allowed on trails or boardwalks. Falsely portraying a pet as a service animal is considered fraud and is subject to federal prosecution.
Service Animal Permit Required
Individuals intending to take a service animal into the backcountry must first obtain a service animal permit (533 KB PDF—form is on the second side). A service animal permit is not needed when visiting frontcountry attractions and thermal areas with boardwalks.
To obtain the free service animal permit (533 KB pdf) fill in the required information on the form. Bring the signed form to a backcountry office within the park or send it to the Central Backcountry Office prior to arriving in the park.
Forms can be mailed to:
Central Backcountry Office
If you need more information, you can contact the Backcountry Office by phone at (307) 344-2160 or by fax at (307) 344-2166. You can also contact us at e-mail us
Things to Know
Where domestic animals and wildlife overlap there is a possibility of exchanging diseases between the two groups. Domestic dogs can introduce disease into wildlife habitats and the park's canids (wolves, coyotes, and foxes) are vulnerable to domestic diseases such as canine distemper, parvo virus, rabies, mange,etc. Likewise it is possible for domestic dogs to acquire these diseases from wild animals.
The Service Animal Permit provides park managers with reasonable assurance that domestic service animals traveling in the backcountry are free of diseases which could harm wildlife.
To further prevent the spread of disease:
Please be aware that having a service animal in the backcountry may put you at increased risk for confrontations with wolves, bears, and other wildlife. There are recorded instances of domestic dogs killed by coyotes within Yellowstone and numerous instances of dogs killed by wolves and bears outside of Yellowstone. Wolves are very territorial and may perceive domestic dogs as competitors and act aggressively toward them putting you and your animal in danger.
If you must take a service animal with you in the backcountry keep it on a tight leash at all times and sleep with it in your tent at night.
In addition, thermal features pose a special risk to all animals. Boiling water in pools and thermal channels can cause severe or fatal burns if your animal decides to take a drink or go for a swim. Your safety and the safety of your animal are not guaranteed.