I'm trying to deter manure eating dogs - chicken, duck, horse. It's tiring to have to go around sprinkling everything with cayenne pepper. Has anyone experimented with nutritional alternatives with any success? I've had some success with increasing bone meal or protein (dogs are fed homemade food) but can't narrow down which. Increasing either has it's down side. Protein - hyper dogs, extra bone meal (phosphorus) can be dangerous for developing dogs. Feeding the chickens hot pepper is doable but only for them. Ducks can feel the burn and, of course, horses could. I wonder what cayenne or similar chilis do at the opposite end even if the hens eat it (they will). Do they also get burny bottoms?