★★★★★
I raise rabbits and worry about hairballs since rabbits can't throw up the hairballs like cats I read on the internet somewhere that prunes, pumpkin pie filling and also 100% pure unsweetened pineapple juice can help break up the hair and allow it to be digested.
I have used both prunes and pineapple juice with no problems. Every so often I either give my rabbit a prune, pineapple juice mixed in the water or even some pumpkin pie filling and have been fortunate enough not to have hairball problems.