What Is Pain?
According to one definition, pain is a usually localized physical suffering associated with a disease or an injury. It's also described as an unpleasant sensation that occurs when nerve endings are stimulated. Whether in humans or animals, pain is a complex phenomenon with physical and psychological components. Pain is often difficult to recognize and interpret in dogs, but in no way does that imply they don't feel it.
Whether pain is short-term or long-term, it can make your dog's life very unpleasant if it's not managed properly. Pain may certainly have a protective role in minimizing injury and preventing further damage, but unrelieved pain can make a dog's condition worse and has no beneficial effects. Any time you believe your dog is in pain, ask your veterinarian what can be done to help.