One of our horses is super sensitive to bugs around his face for some reason. I know this does not solve the bridle problem but might help with the bug irritation...I got one of those fleece mits to apply fly spray, that way I can saturate his face without annoying him. With enough spray the bugs stay away from his head.
Another good idea, thanks, Juniper. Yes, she does seem to shake mainly because of flies, it's not constant and only started with fly season. I'm just afraid she'll figure out what a great trick it is and start doing it on purpose.
We get awful deer flies around here, I feel like shaking myself after half an hour on the trail--
If you are using an English bridle that fits your horse correctly and is adjusted correctly then it should be impossible to remove it without undoing the throatlash - no matter how much your horse headshakes.
The original purpose of the bridle with throatlash was to enable gun-carriage horse artillerymen to be able to pull on the reins to help the horses pull heavy loads out of mud - so they don't come off no matter how hard you try.
If your horse is shaking it's bridle off then it either dosen't fit or is not properly adjusted to your horses head - it's as simple as that.
There are a couple pictures on page 1 of this thread. Very interesting. Can't imagine how to fit it otherwise than it is, other than a readjusting of the browband, um.
I like the history, didn't know that.
Are the cheek pieces adjusted correctly? I can't tell from the picture whether or not it is; when it is adjusted correctly there should be two wrinkles on the sides of the horse's mouth where the bit causes tension.
About one and a half wrinkles I'd say. Can try snugging up a notch to two wrinkles but she looks like she's grinning and fusses. Wondered if it was the bit, we just switched to a Korsteel French link with rather more curved bars.