She is very reluctant to put weight on it, back left, swelling in fetlock and halfway to hock, slight heat. She is fairly happy to flex her fetlock all the way back but will not stretch it out forwards, almost as if the tendon is contracted.
She is 13hh, 3yrs old, paddocked with 2 other horses.
Any ideas on what this might be? Hoping for the best but prepared for the worst. Vet will be out at 12:30 - 1:00 pm..