Pets occasionally escape from their owners. Domestic animals generally lack the ability to survive in the wild. A loose dog can lead a bear directly back to you. There is a strong possibility that your pet could become prey for a bear, coyote, owl, or other predator. There is a possibility of exchange of diseases between domestic animals and wildlife.
Thermal areas pose particular hazards to pets.
Boiling water in pools and thermal channels can cause severe or fatal burns if your pet decides to take a drink or go for a swim. Pets may accompany you in the front country areas of the park. This includes any areas within 100 feet of roads, parking areas, and campgrounds. Pets must be kept under physical control at all times - caged, crated, or on a leash not to exceed six feet in length. It is prohibited to leave a pet unattended and tied to an object.