When you have a dog or cat innoculated they say you should have it done by a certain date, although they give 14 days either side as still being effective- I thought this was the same for horses but I have come a cropper today and would like someone to confirm for me if, if my horse had her jab say on the 1st january one year and then on 9th January the next year, would I then need to start a full new course and have all 3 injections done? And we are talking injections done a good few years ago now.