This is a female, 6 year old black angus cow. Over a ten day period she has lost about 300+ pounds, but she is eating and drinking fine, using the restroom regularly - no diarreah. Her back legs seem to be "locking" and have progressively worsened. She can barely walk now - usually falls. At first she had a lot of nasal discharge (clear) and slobbering. After a shot of Teramiacyn (sp?) the slobbers and nasal discharge stopped. We have administered 2 shots of LA200 over the last 3 days. Legs are getting stiffer. Your suggestions will be very much appreciated as this is our 6 year old daughter's cow.