According to PetCareRx INC. heartworm diseases symptoms can be initially quite subtle. In the early stages of the disease, there may not be any visible symptoms at all. This makes heartworm disease very difficult to diagnose, which is why a monthly treatment for heartworms disease is crucial. There are four stages of heartworms disease, which all include different symptoms and signs. In stage one, you may not notice anything at all your animal will seem perfectly healthy, however you might notice the slightest cough. During stage one, many blood tests will come back negative showing no sign of heartworm disease. Stage two consists of moderate symptoms that include a lingering cough and fatigue after exercise. You may be able to notice these
