Hi ALl, ]While Pineapple juice is excellent for hair balls in rabbits ( herbivores etc.) there is some speculation as to whether it will do any good against ferret, cat dog hairballs. THE REASON? Well ferrets cats and dogs are CARNIVORES being so and on a meat based protein diet -- the structure of the hair follicles varies greatly. I personally do not know if anyone has tested the pineapple juice on carnivore hair to measure rate of breakdown -- if so please post and let us all know. In the meantime-- it may not be a bad thing for pet ferrets, - but I would NOT buy stock on the chance it will remedy a hair ball blockage problem if it is currently suspected . I would recommend using unscented vasoline or white petroleum jelly in lieu of feline hair ball remedies if you suspect a hair ball blockage that needs a quick assist. Alicia and the many faces at Ferret Wise http://www.dartmouth.edu/~crassi/index.html stop by iGive and click through-- this will help us raise pennies to assist our rehab patients at the shelter! Thanks so much the kids appreciate it! http://www.igive.com/ferretwise [Posted in FML issue 3144]