Some of you might remember I asked about my head-shaking horse in another thread last week. For those who don't here's the short version. 20year old horse started chewing bit and then shaking head with increasing violence till if I didn't keep a hold of the reins they would fly over his head. His teeth was done late november, I gave him December off to recover from quite severe dental work that was done. I saddled him again Thursday am and after about ten mins the head shaking started again. I tried to ride it out, but it got so bad I gave up and got off. I called my vet this morning thinking to get him out to check Hans over for me, especially the teeth, just in case. He sent me a thick snaffle (dad was in town, picked it up). Now apparently like everyone else he thinks there's a problem with the bit I use. He has been ridden in a jointed pelham for the six years I've had him. This is the bit that he was ridden in by his previous owner for the I don't know how long they had him. (They ride all their horses in jointed pelhams).
Now what I don't understand is: Why would a horse who has been happily working in a pelham suddenly have a problem with that bit? Can floating his teeth make that much diffs? I'm not against putting him in a snaffle, but not sure about the very thick eggbutt he sent me, Hans doesn't have a lot of space in his mouth and in general seems to prefer thinner mouthpieces.
The other thing I've noticed is he seems to have a bump on his left elbow, can that somehow cause the head shaking? He is not noticably lame.