Dogs communicate their pain in very subtle ways, but some signs can be clearer than others. If your dog is excessively howling, whining, crying, yelping, barking or growling, they could be trying to tell you they’re in pain. Abnormal Habits If your pet’s behavior has recently changed, it could be a sign of pain. If your dog is sleeping too much or too little, changed their appetite, constantly panting, or limping, these are very likely symptoms of pain in dogs. Many dogs already nap throughout the day, but a significant change in the time they spend sleeping (or awake) can indicate something is wrong. Panting is a normal behavior for dogs and helps them cool down after exercise or play time. If you notice your pet is panting for extended periods of time, call your vet immediately. It could be a sign of pain or respiratory issues. Whining or Barking Dogs communicate their pain in very subtle ways, but some signs can be clearer than others. If your dog demonstrates sudden or unusual aggression (including unnecessary biting, growling, barking, or violent attacks), it might be due to pain or a physical irritation.