1. We have three styles of this pet knee pad to choose from, please purchase according to your actual needs. 2. Provide elbow support and improve the mobility of dogs suffering from elbow arthritis, eczema, dysplasia and shoulder dislocation, protect dogs from elbow calluses, bedsores and help wound healing. 3. The patent-pending design is based on the dog's body anatomy, so it perfectly adapts to the animal and ensures a safe fit and comfort, and provides elbow support and protection in all situations-standing, walking, running, jumping, sitting or lying down. 4. The soft and breathable compressed fabric provides much-needed support for your dog during the expected period of use, while the elastic strap and close-fitting design provide flexibility and sufficient freedom of movement. Your dog should feel comfortable inside. 5. This dog elbow protector has been tested for comfort, health and support levels on the most popular dog breeds, and has been recommended by a veterinarian. 6. S: leg circumference 11-13CM foot circumference 10-12CM foot height 9CM total height 24CM 7. M: leg circumference 16-20CM foot circumference 14-18CM foot height 13CM total height 35CM 8. L: leg circumference 22-28CM foot circumference 17-23CM foot height 16CM total height 41CM