Dog Labored Breathing Vomiting. When your dog has difficulty breathing, you may notice fast, laboured breaths, a wide open mouth and an extended tongue. Heavy breathing or panting can also be a symptom of heat stroke.
Another common sign of abnormal breathing is when your dog is breathing heavily or panting but isn’t warm and hasn’t been exercising. What does labored breathing in a dog look like? (your veterinarian can help you determine if your pet is in pain).