I used MTG on an alpaca that had some thickened skin. Almost like a thick scab. She had it on her chest and down her front legs. Had lost fiber. I spread it on her once a day and all the scab stuff came off and her skin went back to normal. Fiber grew back too. I liked the stuff.
I used it on my TB's tail when I first got him. He must have been allergic because he promptly tried to rub every hair of his butt and seemed very uncomfortable within minutes. I quickly washed it off and did not use it again. The company gave me a complete refund and said they were sorry. It is not supposed to get on anything but a horses mane and tail, the hide elsewhere can be sensitive to it, and I had dripped it on his butt cheeks and he WAS sensitive. I don't know about other animals, but I would suggest being very conservative the first time. We ended up with less tail not more!