My mare injured herself in a fall and acquired a very large wound on her left hind. I needed to be able to put animalintex on it, to help drain it. I have discovered a 'SHEATHING TAPE' that is a semi transparent tape used for constuction. It is red and has the words 'tuck tape' on it, and is found at Home Depot in the paint department.
It will stick to the horse's hair and not cause any skin irritation. The area needs to be clean and dry. I attach the tape verticaly, so it will not pull off when she moves, and use several long pieces. When i attach it to her hair, i place my hand on top of it for approx. 1 min; which i believe warms the glue on the tape to help stick it in place. This holds the dressing on while she is in her stall overnight with minimal acitivity.
Hope this helps with you caring for your horse.