A friend of mine has a mare who would/does "twitch" all over her body. We had no idea what it was, but today I saw a video of a horse having a HYPP attack, it was pretty much exactly the same thing my friends QH has.
Is this pretty much what it is? Or is there something else it could be?
Does it hurt the horse?
I know when this has happened to her horse in the past she will continue doing what she was doing (ie. Tacking up, riding, bathing, brushing, etc.).
What should be done?