One thing about BluKote is that it can't hurt the animal. The worst it can do is make the area purple. If it is a fungus infection, you should see a rapid improvement. If you treat the animal for say, five days, and it isn't better, most likely it is not a fungus and you need to look for something else. One of my bucks that was out in pasture and not observed regularly came in nearly bald. I sprayed him generously with BluKote. He looked really funny there for a while. I mean it isn't every day you see a purple buck. He cleared up very promptly and grew in a nice new coat of hair. I am just very sorry I didn't take a picture of him when he was all purple. He was truly a sight to behold.