He only took bute for 3 or 4 days. He eats hay and the apple treats which are way thicker and harder than feed. The smell of meds in his trough may be an idea though. I'll try that. I don't guess he thinks the feed is laced, but he probably does know if there is something out of the ordinary that tastes or smells bad.
As far as calling a vet, I can call, but all of the horse people in my area do alot of their own vet work. The nearest vet in any direction that will see large animals is 50 miles away so it's no so easy to get one to come out. They all say to bring the horse to them and when a horse is hurt or sore or truly sick it's not always possible.