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This is not an ad, but I have had very good results by feeding my four cats Science Diet Hairball Control Formula for adult cats. The cats are 2 and 5 years old with widely different tastes, and one is allergic to certain brands. Yet, they all love their 'hairball control'. I have not found any hairballs in the house since I switched to this brand. The food gives them furry, shiny coats. The allergic cat has stopped cratching itself raw. It is also available in a calorie-reduced version for less active cats.
Note: I can also recommend Iams Hairball Control dry cat food.