The FitPAWS TRAX Donut pet balance ball can be used as a balance training tool or for strengthening the core muscles for small dogs. It can also be used for weight bearing therapy. Made of professional-grade heavy-duty PVC material, the inflatable fitness ball is designed for use with dogs, which provides superior gripping and resists damage caused by dog nails. The FitPAWS TRAX Donut provides a moderate balance challenge. Its broad base offers more stability than a round ball. The new TRAX Donut was engineered to be a bit smaller than the previous Donut to increase the challenge and improve results while maintaining the same functionality. You can adjust the balance level by pumping more or less air into the ball. The bumps on the surface help prevent slipping and provide neuro sensory stimulation. Additionally, the new Burst-Resistant Design provides safe balance platform for conditioning and rehabilitation exercises.