Unlike exposure to other toxins, many Agent Orange symptoms tend to take several years to decades to present, and can cause a host of health issues. Initial symptoms tend to include common side effects found with many other illnesses, as well as neurological and psychological problems.
Heavy breathing or panting. Most dogs will pant from time to time because they are stressed or excited, but when dogs pant for no apparent reason and the panting becomes excessive, this can definitely be a sign that a dog is experiencing pain.
There are a number of disease conditions that can result in excessive panting. If your dog is panting excessively when it's not hot, he's not exercising or there is no reason for fear or anxiety, he may have a medical problem that needs attention.