One of my cats has recently started getting large hairballs, and quite frequently too. It isn't really something that I can control with regular grooming. He's a short hair cat and doesn't appear to over groom himself. I feel really bad for him every time he tries to throw up a hairball, it sounds really painful. I heard that hairball gel could be a good solution to help him pass them instead of throwing them up, so now I ask, what hairball gel would you guys recommend? Any specific brands or flavors that you've had luck with?