Excessive panting can be caused by pain, obesity and Cushing's disease, according to Vetinfo. It also sometimes occurs when a dog has heart disease, and it can be a side effect of some drugs, such as prednisone.Continue Reading
Heavy panting immediately following exercise is normal, notes WebMD. However, if the panting continues too long or is combined with weakness, glassy eyes, vomiting, diarrhea or drooling, the dog may have heatstroke. Seizures, a rapid heart rate and a fever of more than 104 degrees Fahrenheit are also symptoms.
Pain is a common cause of heavy panting, according to WebMD. The dog may also seem restless and anxious, or it may lick excessively at the injured area. Some dogs may be reluctant to eat or lie down.
Respiratory problems are another cause of panting, reports WebMD. These may include pneumonia and lung tumors. Brachycephalic breeds, such as pugs and Boston terriers, are also more prone to heavy panting due to their short noses. However, even these dogs should not pant for more than 10 minutes when at rest in a cool environment, notes MedicineNet.
Heavy panting is generally a sign that a dog needs veterinary attention when it comes on suddenly for no apparent reason, according to WebMD. Persistent panting for no reason is also an indication that something is wrong. Owners who think their dogs may be in pain should also seek veterinary help.Learn more about Veterinary Health