Thank you so much everyone answering my question!
check the way all of your tack fits
If your physio checked his poll out it probably isn't the bridle. Have you checked his teeth? He could of chipped one or have a sharp edge. After that I would check for lameness. It head tossing could be his way of finding some bit of relief from it....because it came on so suddenly and voliently I wouldn't imagine it is behavioral and just a habit he has decided to pickup. Something will have triggered it.
I had a horse that if I put a gag bit on her she would chuck her head up and down very violently. I couldn’t even ride her. Then I got a snaffle and she was perfect
I’m also thinking that and I’ve got the phsyio out and she couldn’t find anything. I am going to try and see if it’s maybe his bridle that’s causing this.
I have had the physio out and she does say that nothing is wrong with his back. And thank you I’ll definitely try those!
This did come very sudden. One day he was fine and the very next he was throwing it violently. I have had people check his back but I’m definitely going to get someone to look at his head. I am going to change his bridle to see if that does make a difference but what I don’t understand is that he’s already in a relief bridle.
Thank you all so much for your replies and sorry I don’t know how to reply individually!
Could be spasms, some horses do that with different types of
If there is nothing wrong with his back, you could try elastics/bungees to encourage him to stay in an outline and not fling his head.
Did this come on fairly suddenly? I would get a really good back man out. It could be something like a trapped nerve or his poll could be out and the pressure from the bridle would be causing him discomfort.