Natural Remedies to Prevent and Treat Hairballs in Pets

I stumbled onto this site -- which is now bookmarked for future reference! -- looking for a fix for constipation and will be picking up prunes and pumpkin on the way home tonight but wanted to comment on the furball remedy my kitty liked best. Bertoli's Extra Virgin Olive Oil! It was the only one she liked but it worked like a charm. I'd give her about a teaspoon every day in a separate bowl, she'd gobble it up and no more furballs! And I liked it for cooking!