Safari Undercoat Dog Rakes penetrate deep to remove undercoats. The double row dog rake features two pin lengths for dogs with thick, heavy coats. Both designs feature precision tapered pins that penetrate deep into your dog’s coat. Safari Undercoat Dog Rakes with rotating pins gently pull through the coat to remove tangles and prevent mats. The double row undercoat rake is for breeds with a thick, dense undercoat.