Petface Seriously Strong Bone Tread Toy. The Petface Seriously Strong Bone Tread Toy offers a strong and durable bone shaped toy to give your dog hours of chewing fun. This can also be used to play fetch with your dog. Any dogs dream toy. *Pets should be supervised when playing with toys. Although designed to take a chewing, the Petface Seriously Strong collection is not completely indestructible and will be susceptible to chew damage. The life of a Petface Seriously Strong toy entirely depends on the ability and strength of your pet. Monitor for wear and replace if damaged*