A donkey that reacts aggressively to the dog has a good chance of being an effective guard animal. A few progressive livestock producers in Missouri use llamas as guard animals. Studies in Iowa have shown these animals to be quite effective in protecting sheep, goats and cattle. Aggressive toward both dogs and coyotes, llamas are easy to handle and bond with livestock in a matter of days. Although expensive initially, their longevity of 12 to 18 years and their usefulness as guard animals make the price reasonable over time.
Llamas require little attention because they feed with the animals they are protecting.
The fence should be at least 7 feet high to keep coyotes from jumping over it. An outward slant to the wire at the top can be added to keep coyotes from climbing over, and an apron of wire extending outward from the bottom will keep them from digging under the fence. If the apron isn't used, a few well-placed snares or traps should catch the occasional coyote that digs under the fence. A shorter, woven-wire fence can be made taller by attaching extensions to the posts and adding extra wire. Contact a fencing company for specific details.