The reason for this is the following：
1. Unbalanced walking and running: Unbalanced strength of front and rear legs may affect the walking and running of dogs, and it is easy to fall or sprain.
2, joint problems: the front legs are thicker than the rear legs, which may lead to greater joint pressure, thereby increasing the risk of joint inflammation or injury.
3. Bone problems: This situation may reflect poor bone development, such as calcium deficiency, which leads to fragile bones and easy fracture.