Ok, my friend's TB gelding, who is 20 years old, has gastric ulcers, and is on a super high protein diet is urinating blood and very very sore in his back and kidneys. Like his hind end buckles when you apply pressure kind of sore. I am a vet tech at a diagnostic lab and have run a CBC, Chemistry Panels, UA, cultures, and Leptosporiosis PCR. All have been undiagnostic. However, the horse is still having this problem. I believe it could be uroliths, as does the vet, however the owner will not accept that perhaps she should scale back the horse's activities. Like you know, not jumping him 3'6" or cantering and trotting him for hours a day. The clots in his urine increase in size and number with exercise. I also suspect that the high protein diet is not helping the situation. He is sore, cinchy (always has been because of the ulcers), having painful urination, and generally kind of depressed. He lost a lot of weight suddenly including muscle mass. I suspect there is more to this than her excuse of "Oh, he needs a Chiropracter." What he needs is his urethra and bladder scoped, and to not have the crap ridden out of him.