TRAINING PET - this is an interesting dog toy ball, used as a ball to keep your dog mentally and physically stimulated, it can also be used as a recovery ball. TRAINING PET - this is an interesting dog toy ball, used as a ball to keep your dog mentally and physically stimulated, it can also be used as a recovery ball. HELPS CLEAN THE TEETH - the thorns can massage the gums and tongue, reducing dental plaque and tartar reproduction, preventing a variety of oral diseases. SOLID BALLS - not hollow. High durable, difficult and unpredictable rebound. EASY TO CLEAN - just wipe with a cloth or rinse with water, please contact us if you have any questions SAFE AND NON-TOXIC - Made of natural rubber, no chemical smell, Non-toxic, healthy and safe for supper. HELPS CLEAN THE TEETH - the thorns can massage the gums and tongue, reducing dental plaque and tartar reproduction, preventing a variety of oral diseases. SOLID BALLS - not hollow. High durable, high rebound hard and unpredictable.