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.
The panting is usually accompanied with other symptoms of illness. Some of the respiratory conditions that can include abnormal panting are: 1  A collapsing trachea: A dog with a collapsing trachea has a cough that sounds similar to a honking goose. 2  The cough is generally triggered by physical activity or excitement.