Purina One +Plus Hairball Formula Chicken Support your cat with the combined power of nature and research in Purina ONE +PLUS Hairball Formula adult dry cat food. This easily digestible recipe includes a SmartBlend of high-quality ingredients. The hairball control cat food starts with real chicken as the #1 ingredient and has 38 grams of protein per cup helping to support her strong muscles including her healthy heart. A natural fiber-rich blend helps minimize and control hairballs and four antioxidant sources in this hairball cat food help support her strong immune system.