Since coming back from holiday I noticed that my horse has started shaking his head when he's ridden. It's become more violent and he also sticks it up high and to the side sometimes. He's done this both out hacking and in the school and has never done anything like this before.
It's not the flies as we put repellent on and tried a nose net and he did the same thing when it was windy. He's fine to tack up and okay when led. We've checked all over for any lumps/bumps etc. and his tack all fits correctly. I did try riding him with a headcollar and two leadropes jinstead of a bridle and he was much better.
So we got the vet out but she found nothing wrong with his teeth/general mouth area and he's eating fine.
Also, he's 18 so I don't think hes developed an allergy or anything. Anyone got any ideas? The next step would probably be to get the back lady out although I don't think this it the problem.
Thank you in advance!