I recently bought a booster for my horse (fluvac 6 from fort dodge) and as I was putting the needle on the syringe, the syringe cracked and leaked. (geez, the fort dodge syringes are CHEAP, I will definitely use my own next time) Anyway, I vaccinated my horse with what was left, about .5 mL. I probably should have thrown it away and bought another, but I had this one next-day shipped and everything and I wasn't thinking. My question is: will my horse have sufficient protection with .5 mL instead of the regular 1 mL booster? Would it hurt or help to give him another booster in a few weeks or months? Thanks!