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Fever refers to an elevated body temperature. The normal body temperature range for dogs is between 100.5°F and 102.5°F (38.1°C and 39.2°C). To be classified as a fever of unknown origin (FUO), the body temperature must be above 103.5°F (39.7°C) for longer than a few days, with no obvious underlying cause based on history and physical ...
The term fever of unknown origin (FUO) is often overused in veterinary medicine, as the number of patients in which a true cause of fever cannot be uncovered is relatively small. In 1961, Petersdorf and Beeson first defined FUO in humans as a fever ≥ 101°F (38.3°C) that persists for greater than 3 weeks, with the diagnosis uncertain after one week of study in the hospital .
Often, a fever resolves on its own or in response to antibiotic therapy. However, in a small percentage of animals, the fever continues or keeps coming back and the cause cannot be determined. This is called fever of unknown origin. In dogs, the most common causes of fever of unknown origin are infections, immune-mediated diseases, and cancer.
- Andrew J. Allen
In dogs, blood testing for other organisms such as Lyme disease or systemic fungal disease may be performed if the clinical signs and screening tests suggest the possibility of such an infection. Fever of unknown origin is a term that is generally used to refer to a persistent fever of greater than 39.7 °C (103.5 °F) for which the underlying ...
Mar 8, 2019 · Identifying the cause of a fever of unknown origin (FUO) in dogs presents a considerable diagnostic challenge. The diagnostic workup can be frustrating for veterinarians and clients, especially when it fails to reach a final diagnosis after extensive testing. Fortunately, most causes of FUO can be found or treated successfully.
Fever of unknown origin refers generally to any persistent fever (ie, that does not resolve spontaneously or with empirical antimicrobial treatment) for which the underlying cause is not revealed from the case history, physical examination, and initial diagnostic testing. A variety of causes are possible, including infectious, immune-mediated ...
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Dec 17, 2023 · Understanding the causes of fever in dogs. A fever, referred to as a fever of unknown origin when the cause isn't clear, is a rise in body temperature. Here are the main categories that can cause a dog to have a fever: 1. Infections. From viruses to bacteria, infections are a leading cause of fever in dogs.
