My mare has bed sores on her hocks and I can't get them to go away. Vet suggested more stall mats in her run, which I did. I tried hock boots specially made for hock sores and she ripped them off in about 3 minutes. I tried duct tape and I can't get it to stay on. So is there another way to heal these up? Wound ointments don't seem to help although I keep trying. Any suggestions? Would vet wrap over wound dressing work? What brand of duct tape might stick?