I have had my horse 4yrs and in this time i have never had a tetanus jab.My friend recently mentioned this and suggested i had him done asap.My horse is 30yrs old and does react to most of the modern day drugs and wormers eg.strongrid p ,bute and ventipulin.I rather not vaccinate him because of his reactions to most drugs and wondered if any of you guys don't vaccinate against tetanus and what are the risks of not vaccinating.I don't know anything about my horses past so don't know if he has been vaccinated before or how he reacted to it.SOMEONE PLEASE HELP US!