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 Green means "GoughNuts" and Red means "Stop". This was our company's first design and to this day remains as our flagship product. For 99% of power chewing dogs this is a great safe product. Green means Go and Red means Stop!