The dog’s hind legs are not strong because of 1. calcium deficiency, generally seen in the growth period of puppies. 2. too long in the cage, the cage is small, the hind legs are not fully stretched. 3. lack of exercise, not enough exercise to exercise the hind leg muscles. 4. hip joint dysplasia, generally seen in large dogs. 5. joint wear and tear resulting in pain, excessive weight or too much exercise resulting in joint wear and tear, causing pain in the hind limbs. 6. Excessive growth, mostly in large breed puppies, is caused by blind overfeeding, resulting in uneven joint and muscle development. 7. Knee slippage and patellar exostosis, mostly in small breed puppies, is caused by walking with three legs suddenly jumping, and can seriously affect the movement of the hind legs.
