Heartworm disease is caused by a parasite called Dirofilaria immitis, better known as heartworm. Dogs become infected when they are bitten by an infected mosquito that is carrying immature heartworms. This handout discusses signs, diagnostic tests, treatment, and prevention in dogs.

Fever of unknown origin is a term used for persistent fever in pets. It has many possible causes, including infection, immune-mediated disease, and cancer. Initial steps in diagnosis are history and physical exam, followed by standard screening tests, including a complete blood count, biochemistry profile, and urinalysis. Further testing may be indicated. This article outlines the typical tests.

Diarrhea can be a simple diagnosis or a complex one. A thorough history and physical exam may be enough to determine the cause; however, in less obvious cases, various tests may be needed. Pending the results, a treatment plan can be developed.

Listlessness and inappetence are vague signs that can occur in pets for many reasons, both physical and mental. Diagnosis starts with a thorough history and physical exam and may progress to screening tests, including a complete blood test, biochemistry profile, and urinalysis, as well as additional tests. This article outlines the typical tests for listlessness and inappetence.

Coughing can have many different causes, including infectious disease, heart disease, inflammatory conditions, anatomical abnormalities, or cancer. Important for the diagnosis is a thorough history, physical exam, and screening tests, outlined here. More advanced diagnostics are also summarized.