[header] How to give a horse an injection [title] Ask an experienced horse person to help out. [step] If you're reading this article, you likely don't have a lot of experience with giving injections. It's a good idea to have someone to help you-either an experienced horse person or your veterinarian. 
You should certainly have an experienced professional supervise you the very first time you give an injection. If your veterinarian can't make the trip, see if a vet tech can help you out.