The ability to use their tails for balance in the wild is very important for them, but when they get a little older, this becomes a problem. Something that is great for keeping their tails is the hair ball. You do not have to worry about your Persian cat having a hairball, but you want to make sure that it is controlled. Hair balls can sometimes be fatal and the Persian cats that are left loose often find themselves severely injured. You want to take measures that will help you keep your cat from being injured.