In dogs with large heartworm infections, symptoms include a persistent cough, fatigue and loss of appetite, according to the American Heartworm Society. However, most dogs show no noticeable symptoms in the earlier stage... More »

In the early stages of heartworm disease, a dog displays few symptoms, but as the parasites grow and multiply, it starts to develop a persistent cough, fatigue, decreased appetite and weight loss. It may become reluctant... More »

www.reference.com Pets & Animals Pets Dogs

While many dogs do not display symptoms of heartworm disease in its initial stages, as the disease progresses, dogs often begin to display a mild cough, according to the American Heartworm Society. Other early symptoms i... More »

www.reference.com Pets & Animals Pets Dogs

Symptoms of heartworms in dogs include a decrease in appetite, weight loss, fatigue after moderate activity, a reluctance to exercise and a mild, persistent cough, according to the American Heartworm Society. As heartwor... More »

According to the American Heartworm Society, coughing, difficult breathing, fatigue, vomiting and loss of appetite are common symptoms of heartworms in cats. Cats can die suddenly after being infected with heartworms eve... More »

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Symptoms of lung cancer include a cough that does not go away; chest pain that is made worse by coughing, breathing or laughing; hoarseness; loss of appetite and weight loss; coughing up blood or sputum that is rust in c... More »

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In the early stages of heartworm disease, a dog displays few symptoms, but as the parasites grow and multiply, it starts to develop a persistent cough, fatigue, decreased appetite and weight loss. It may become reluctant... More »

www.reference.com Pets & Animals Pets Dogs