Pet Naturals Hairball is a state-of-the-art supplement to help support optimal skin and hair health. HAIRBALL comes in a delicious chicken liver fl avored soft chew that cats love the taste of. Unique Whole Health Formula HAIRBALL is a breakthrough formula to support skin tone, elasticity, and hair health. Hairball focuses on factors in cats such as healthy skin, G.I. tract, and urinary tract health issues.