I found some livestock dye at my local feed store that says that it is safe to use on all livestock. My horse is in the middle of show season and he has golden stripes on his neck where he sweats with his fly sheet. He has to wear a fly sheet because we have pigeon fever all around the property where he is at. I hose him off at least once a week as well after I ride him. The stuff is called weaver prodye and it's made for dying show cattle and sheep black. Do you think it would be safe to use on a horse's coat in the bleached areas? I would spot test him first, but I was wondering if anyone had heard of it.