Quick question I'm hoping someone can help with. I've always used these but haven't bought any for ages. My horses current sets are worn out so looking to replace. On his fronts he has boots with two straps and on back legs boots with three straps. Do the number of straps equate to the size, I.e. Large =3 straps, medium=2? Trying to work out what to order and can't check the current boots as the label is now unreadable! Thanks in advance for any help!