Horses are vaccinated twice a year (fall and spring) with a variety of vaccines.
A lot of the vaccines that I've seen have said to, after the inital shot and the booster, to give it annually. No where does it say bi-annually.
Look at dogs and cats, they are given shots and then every year after that are given them again. You don't have to bring them in 2x a year.
Are vaccinating them twice a year really necessary? I can understand if you travel and/or show alot, but for the backyard horses is it really necessary?
How often do you vaccinate?
I would love to just vaccinate 1 time year, but I don't want to risk them getting something.