I've got a 20 month steer on 5lbs of 12% and free choice 1st & 2nd cutting grass hay. Living in ice and snow covered pasture in NY state. He is separated from herd for finishing. Developed major swelling in right front and rear leg and quarter. Thought he had foot rot and treated with 45 cc LA-200. 2 days later was able to get him in and look at feet. They were perfectly healthy. Swelling in front quarter has gone down but rear quarter and legs are still swollen with a slight limp. Now on week #3. Any ideas?