Yes, you do and now I am wondering why they didn't get the shots. The vet's writing is so bad, it is hard to understand, just what she wrote down on the slip. That is what I get for not going. Kids just don't ask enough questions. I will have to call. Maybe, it was not such a bargain after all.
According to what my vet told me, you only have to do the booster shot the first year, after that it is a once a year shot. Did your horses get the WN last year? If so they won’t need the second one this year.
Becky