According to WebMD, the only way for a dog to get heartworms is through the bite of an infected mosquito. Until the larvae mature, there is no way to determine whether or not a mosquito is infected, which leads WebMD to ... 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 »

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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 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 »

Revolution is a prescription-only medication that protects dogs against heartworms, fleas and other common internal and external parasites, according to the Revolution website. It is topically applied, and is used on dog... More »

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An early sign of a spider bite on a dog is swelling at the site of the bite. Upon close inspection, puncture wounds or an abnormal lesion may be visible. There may be redness and indications that the dog is in pain by ex... More »

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Ticks can be found on dogs by doing a thorough body check, according to PetMD. Ticks generally congregate in dark areas and are usually found under the collar, under the tail, around the anus, between the toes or along t... More »

www.reference.com Pets & Animals Pets Veterinary Health