Booster/Injection intervals

[McNally]

I was just putting my horses injection dates into my diary as one has been away on loan and notice one was last done on October 18th last year and the other was September 30th.
I can never think how early its ok to inject (if there is a limit) I know they cant go over due but can i get these two done on one vet call out and if so when?!

 

[be positive]

No problem to do early, under FEI and racing rules they now have to be done every 6 months.