Looking for anyone who’s dealt with something similar. I can’t find any relevant information online, but it’s truly bizarre to me.
My horse is a 16yo AQHA gelding, 16.1h. I’ve had him for 8y. He’s an absolutely lovely, in-your-pocket type who is generally easy to handle on the ground and beautifully trained under saddle. We play around with western pleasure-type events, basic dressage, and H/J up to about 2’3. He has a history of severe arthritis and allergies going back to when I bought him. Generally he is an absolute delight with the caveats of: being not very sound and quite sensitive and spooky.
About 9 months ago he started developing photic headshaking symptoms, roughly at the same time as he developed severe stiffness to the neck on one side. Vet DX’d headshaking and imaged spine, finding the following: “Radiology report of cervical spine notes C4-C5 (mild), C5-C6 (mild-moderate), C6-C7 (moderate) osteoarthropathy and C6-C7 intervertebral foraminal stenosis vs superimposition of the enlarged articular process joint.” Injections resolved the spine issue, and the headshaking stuff has been fairly manageable with fly masks and riding at night. If we ride in broad daylight he’ll toss his head intermittently for a few minutes before settling down into work.
Also starting about 9 months ago, he started developing bizarre behavioral responses to me crossing in front of his head, where it had never been an issue before. If you try to cross over, he follows you to keep you on one side of his head. If you try to force the issue and he has the space, he’ll start trotting around you. He has occasionally lightened in front if you really push him to stay put while you cross over, and always looks very uncomfortable, tense, and frozen. Once you do cross, he kind of twitches and licks and chews. To me, it seems to be quite a clear pain response.
Most of the time I’m able to avoid the issue entirely, but the workarounds aren’t always the safest. i.e. ground tying him and going around his hind end every time I need to tighten the girth, put stirrups down, etc. If he follows me through a narrow space he can get quite anxious and occasionally rush through my space, which is obviously unsafe behavior, though there have never been any close calls. However, something is clearly not right and I want to figure this out if possible.
It’s not absolutely consistent, and maybe presents at some point 70% of the times I handle him. It presents crossing from one side to another in the front, but not if you go around the back. The side from which you start doesn’t seem to matter. He’s fine once you’re on the other side. It doesn’t present if you try to switch him from one side to another at a distance, like on a lunge line, but it does present significantly when I try to do groundwork on a 10ft rope. It never presents under saddle. It occasionally presents if you try to swing something around his head (i.e. put english reins over his head, and they cross his field of vision). Otherwise, he is generally not headshy. Similar behavior presents if you try to press between his nostrils, though he’s fine being touched around his forehead.
I thought it might be vision, but the vet’s vision exam came back asymptomatic. I personally doubt it’s behavioral/disobedience since it’s such a specific thing, had never been an issue before, and also since he’s generally an extremely compliant, good-tempered, and well-trained horse, but of course I may have a blind spot where he’s concerned. I don’t know if this kind of thing may be linked to headshaking, but it presents at all times of the day, so it doesn’t seem to be triggered by daylight. It’s continued while the cervical spine stiffness has resolved, so those don’t appear to be linked.
I’m curious whether anyone else has dealt with anything similar, or has any ideas of how to approach diagnosing and managing a horse with these symptoms. I have the vets coming out again, but I’d love more ideas for things to research, look out for, test, and potentially get video of in case the behavior doesn’t present during a vet exam.