The Head Above all other places, trimming the hair on the head of a horse allows you to accentuate his positive features. If your horse is a bit coarse in the head, removing the excess hair will at the very least give him the appearance of a clean, dry head which, while it may not be beautiful, is never the less handsome or majestic. Again, use the technique of combing through the hair rather than cutting against the hair growth, especially in trimming the area of the head between jowl and muzzle. The long guard hairs on the muzzle are again guard hairs. Still, I remove them on my show horses.
Ears are always an issue.
Well, remember that hair is in there to protect the ear from insects so, if you remove it, you must do something else to protect the ear. Also, I like to put a wad of cotton or paper towel down in the ear so not only is the sound dampened if I am using electric clippers but so that no stray hair falls down into the ear cannel. No matter if you clip out the inside of the ear or not, be sure to clip around the outside so the shape can be seen. Just clip in back flush with the rest of the hair. I clip all the way to the tip of the ear on the outside and only to the base of the hook on the inside.