A dog lying motionless and dying may be a sign of death. It is best to take the dog to the pet hospital for examination in time to confirm the cause and rescue it in time to avoid life danger. Generally, dogs suddenly appear to be lying motionless and dying, which may be caused by heat stroke, heart disease, poisoning, encephalitis and other diseases. These diseases develop quickly and may cause the dog to die suddenly, so pay more attention and find out When your dog appears abnormal, send it to the hospital for treatment in time.