GoughNut - The original GoughNuts Large toy was designed to address the simple but serious issue of SAFETY. The GoughNuts chew toys are designed knowing that safety and fun go hand in hand. Each GoughNuts pet toy has included in it's design the GoughNuts patented safety indicator where Black/Green means "GoughNuts" and Red means "Stop". The GoughNut Black is reccomended for the extreme chewer!