To prevent troublesome hairballs, apply a dollop of Vaseline petroleum jelly to your cat's nose. The cat will lick off the jelly, lubricating any hair in its stomach so it can pass easily through the digestive system.
Source: My vet told me this years ago.
By Irishwitch from Aurora, CO
If your cat suffers from hairballs, here is a cheap, useful remedy. Just give him a teaspoon of Vaseline every 2 weeks and the problem should be alleviated. By Robin
I have a 15 year old cat that is having a terrible time with hairballs. I have switched to wet food thinking he might be able to get it down easier and keep it down.