If it is lice, have fun shaving! I had to clip my friends horse and ended up with those little buggers in my hair. It was so gross. Fortunately, clipping (and burning the hair) and a really good bath (I may have used some medicated something, I don't remember this was over 10 years ago) did the trick. Also, horse lice don't really consider us suitable hosts so they are easy to get rid of. https://www.google.com/search?q=hors...w=1024&bih=485
Any of these guys look familiar?