CanineGym Gear K9FITbone Canine Instability Training Integrate instability training to develop strength, endurance, proprioception, balance and flexibility with the new K9FITbone K9FITbone provides a low-impact, platform to add full-body conditioning and toning for small dogs and big dogs. The professional grade heavy duty PVC material is formulated for use with dogs, provides superior gripping and resists damage caused by dogs nails Small dogs can place all four paws on the bone; while big dogs can use one bone for the front legs and one bone for the back legs. K9FITbone also features sensory bumps for neural stimulation. Balance challenge can be adjusted by adding more or less air to the platform