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 »

The only way dogs can get heartworm is by being bitten by a mosquito that is carrying heartworm larvae. If an animal is infected with both a male and female, they can breed to produce tiny organisms known as microfilaria... More »

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According to the Food and Drug Administration, canine heartworms are not considered to be a contagious infection because they are not transmitted through direct dog-to-dog contact. As the American Heartworm Society expla... More »

Symptoms of diabetes in dogs include changes in appetite, excessive thirst, weight loss, reduced urination, lethargy, urinary tract infections, dehydration, fruity or sweet-smelling breath, vomiting, chronic skin infecti... More »

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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 »

Symptoms of liver disease in dogs vary but include loss of appetite, weight loss, vomiting, diarrhea and stomach ulceration, states Merck Manuals. Fluid build-up in the abdomen, excessive urination and thirst, weakness, ... More »

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Symptoms of canine lymphoma include unusually large lymph nodes that feel hard and rubbery, swelling in the face, swelling in the legs, lethargy, lack of appetite and weight loss, according to Purdue University College o... More »

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