If enough hair collects in a cat's intestines, it can cause constipation, a blockage or death. While there are any number of hairball preventatives, one of most effective and least expensive is Vaseline.
Safe for Cats
Vaseline's molecules are too large to be absorbed by the intestines. It passes through the body unchanged.
Not a Laxative
Unlike many commercial hairball remedies that contain mineral oil, Vaseline does not act as a laxative.
Just a dab of Vaseline is enough to coat hairballs and ease their passage through the intestines.
Smear it On
Some cats will lick Vaseline off a spoon. Or, if you smear it on the cat's nose or front leg below the elbow, she'll lick it off. Some cats will also eat Vaseline mixed into tuna.
Give it Daily
Give a dab of Vaseline daily for a week or two. Then give a maintenance dose once or twice a week.
Comb Your Cat, Too
Combing your cat with a flea or greyhound comb several times a week will remove loose fur and help prevent hairballs.