Originally Posted by SouthernTrailsGA
One of our Horses had a similar swelling about 2 months after his shots, the vet said it can take a couple of months to have a reaction to the West-Nile shot, could that be a possibility?
You need a new vet. There is no way it should take two months to react to a vaccination.
OP - Do your horses have access to horay allysum?