One of my horses reacted to his shots this year and never has before. Anybody else have this problem this year and not others? With the bipolar weather this year, my horses have been more sneezy, snotty. and allergy sensitive (so have I), which I assume is the reason for this reaction. He's not lethargic or off his feed or anything. Just a small soft swelling at the injection site and he's a little tender there. The vet is not concerned, so I guess I'm not either. He got his shots yesterday, I noticed the swelling this morning when I fed and it was much better at dinner time tonight.