Annually. Bit of you need coggins they’re usually only good for 6 months
Yearly but how many injections depends on if you and your horse is showing or not. If they are showing they will get six shots and but if they aren’t they will get three.
If you are talking about joint injections it all depends on the horse but if you are talking about their vaccines then most of the time yearly or every 6 months depending on what they are getting