The SupaTuff extra strong dog harnesses were developed to be the strongest dog harnesses in the world. They are a free form harness that allows for natural movement of dogs ( running, swimming, jumping) whilst still being a fully functional support dog harness. They are a multifunction dog harness with three size ranges full adjustable to fit any dog body type. Heavy Duty, Regular Fit (coming soon) and Slim Fit. 100% Lifetime Guaranteed. SupaTuff dog harnesses can be used for dog training, protection training, working/patrol all types of dog handling and leisure activities.