Our Mission: Northeast Tri County Health District works with other entities to assess, protect, preserve and promote the health of the tri-county area and established local policy relating to populations based services in Ferry, Pend Oreille and Stevens Counties.
They use these senses to detect intruders. They bray, bare their teeth, chase, and attempt to kick and bite dogs and coyotes. Some donkeys will also chase deer, bears, strange livestock, humans and other intruders in a similar fashion. Donkeys do not intentionally patrol the pasture looking for intruders.
I doubt that a donkey will run off coyotes. They sure as shootin' will NOT defend a barn cat. Your best bet to protect the cats is to have shelter in several locations that they can get into, where the doorway is too small for a coyote to enter. You can run coyotes off with the right dog.