Ok so I have 4yo warmblood mare who recently went into training with my coach for 2 weeks. At almoost the end of the 2 weeks my coach called me and said the my mare had gone lame in the right hind leg and that we should come pick her up. After 5mins of having her home she began galloping around her paddock showing no signs of any lameness. The next day I lunged and rode her and she was almost perfect. We had been planning for her to go to a small competition that weekend and after talking to my instructor we agreed that she would ok to compete in the compitition. She showed to signs of lameness that weekend. On tuesday we had our weekly lesson were she wasn't at all lame, she had wednesday of, then today (thursday) I rode her again we walked for 10mins and she was fine so I trotted and she was majorly lame! We hobbled back to the stables where she was holding her back left leg of the ground (different leg to the first time!). She also has swelling in her back left fetlock and a slight pulse, she is barefoot with very stong feet. Any options on what this could be would be hugely helpful or if anyone has experienced similar?