S: Thigh circumference is 29-32 centimeters, joint circumference is 17-20 centimeters, foot circumference is 13-16 centimeters, and leg length is 25 centimeters. M: Thigh circumference is 36-39 centimeters, joint circumference is 22-25 centimeters, foot circumference is 16-19 centimeters, and leg length is 30 centimeters. L: Thigh circumference 43-46 centimeters, joint circumference 27-30 centimeters, foot circumference 19-22 centimeters, leg length 35 centimeters. 360 degree support: Lightweight compression ensures stability, improves balance between muscle groups, provides comprehensive support, and prevents injuries from escalating into more serious situations. View our video and measure according to our instructions to select the correct size. You can find the size chart in the picture. Pain relief: By increasing joint temperature, it helps reduce inflammation, alleviate pain caused by cruciate ligament injury, osteoarthritis, and knee bone problems. Rapid recovery: The optimal joint temperature can increase blood circulation, improve oxygen delivery, and enhance performance for faster recovery. Our knee pads are designed and manufactured to provide excellent support and comfort without affecting the dog's mobility. High performance chloroprene rubber enhances elasticity and better adapts to dog legs. Some dogs have sagging buttocks, and the waistband may slide backwards and fall off. More powerful support is needed for the knee pads, which are made of 2mm chloroprene rubber and are completely flexible. Gently press to increase blood circulation and accelerate the recovery process.