The dog barks in pain as soon as it rolls over.

One: observe whether there is any trauma on the dog to see if it is serious. If it is serious, it needs to be sent to the hospital for suture. If it's not serious, you can buy some iodophor for disinfection every day. Two: observe whether there are parasites on the dog. Parasites are itchy, and dogs are likely to scratch their skin, which will damage the skin and cause pain. Three: Streptococcus infection, if the dog has fever symptoms, it is likely to cause muscle pain and inexplicable screaming. At this point, the owner needs to go to the hospital for anti-inflammatory treatment. Screaming caused by fracture or other bone pain requires surgery or analgesia.