My Clydes has been lame off and on for roughly a year. Originally it was thought the farrier was the cause. We have changed farriers and the new one has been doing her feet for the last 3 trims (Since August). He comes every 6 wks. I called the vet out at his suggestion because he didn't see anything that would cause her lameness. The vet did x-rays and said she has a medial sesamoid bone cyst. We treated it with Osphos and are now giving her Equi-bone. We will repeat x-rays in about 6 mos. The vet consulted with another vet and they both agreed that this shouldn't cause the lameness. Christmas day I was picking her foot and she immediately went lame. I walked her out of it and she was fine. I even rode her with someone observing her and she looked completely normal even at a trot. As soon as I got off she was limping again. I called the vet Saturday and told him what happened and he is baffled. The vet doesn't think her back is out or that she has thrush. Oh and she was running and bucking (she was having fun) with my daughter on her a few days before and was just fine. I'm at my wits end. I hate to see her limping around the pasture. Does anyone have any thoughts?