Hi choclet, thanks for using justanswer!
I support what Dr Rik Daniels said about the hind suspensory, however I have also seen horses with similar issues that subsequently show compensatory problems with their lower backs in the pelvic and sacro iliac area. This frequently manifests as symptoms you describe, being unable to have both hind feet planted on the ground, unhappiness at the canter, head high, etc. I recommend checking his lower back for soreness in the lumbar area and around the sacro iliac joint, and use enough palpation pressure to really check the soft tissue- a horse that is not sore will not flinch, whereas a sore horse will! Stand on a raised platform and have a handler at his head to steady him. Please be cautious when checking his back, make sure the area is free of alarming distractions. If his back is sore, you may treat it with hot moist towels and sore no more liniment from equilite, inc. (please do not use any other liniment such as bigeloil or absorbine, vetrolin, etc. they may burn his back). If his back is not sore, you may be unable to locate the soreness (a false negative) or the suspensory ligament or tendon issue is still painful for him. In that case, have a qualified bodyworker/cert chiropractor come out for him and check again. Also be aware that he may have residual soreness in the soft tissue above the hind fetlock and a concurrent issue in his low back, both avenues should be explored for his sake (and yours!). Good luck with your horse, and let me know if I may be of further assistance!
sorry I was away for the afternoon. I think it is important to realize that one problem will not preclude the other, or in other words, your horse could have primary and compensatory problems simultaneously. The order of professionals is up to you, if you use your horse cautiously (this is not a behavior problem it is physical, so light use only, no longing or crazy turnouts) you could go with either one first. Since your horse has had the issue for over a month now, you would be wise to listen to professional advice when you get practitioners out for your horse. Good luck and I hope your horse is better soon! Let me know if there is anything else I can do for you!
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