Originally Posted by kitten_Val
Also is there a chance horse can blow up?
When I clip under my horse's jaw I use a 10 blade (or a blade that's pretty short but won't completely bald my horse). That's usually what comes in most horse clippers I believe. I shave the bottom completely and then blend in the edges if that makes sense. I think it's pretty hard to physically hurt a horse with clippers. I mean, I'd avoid jabbing the sharp points into her but I believe in avoiding jabbing any sharp points into my horse.
If your horse has never been clipped before you'll want to desensitize her to the sound and vibrations. That can take a while. Also make sure that your clippers are very sharp. I don't think most clippers intended for human hair are strong enough for horses.