1, dogs exercise too much for a long time, especially some large dogs, which are prone to muscle strain when running. The owner can pinch the dog's foot with his hand. If the dog barks, it means that the dog has pulled a muscle. During the dog's injury, reduce the dog's exercise and let it rest in the sun. After a while, the dog will heal itself.
2. It may also be arthritis or hip dysplasia, which are very similar. For the lame caused by these two problems, you can try Wangxiang Jiebao to see if the dog's condition has improved. If it really doesn't work, it may need to be sent to a pet hospital.