I have mini donkeys in with my horses and mine are good at protcting my horses, by there braying and just making so darn much racket..they in turn let me know ..something is not right or dont belong around THERE pastures! BUT, I would definitely not let donkeys be the only means of protecting my horses, we do have coyotes, bears, deer and wolves around us. I also use welded wire panels and ranch fencing 4' high, my gates all have extra boards on the bottoms to help keep anything (dogs etc) out too. We can never make our pastures 100% safe with wildlife. At night all my horses are right up behind our house and are in a smaller contained area with a huge run-in and also cameras, and also is right next to the barn. I would NEVER feel safe having my horses pastured in a wooded area which contains wildlife, or left way out of site. Corinne