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Fungal Infection (Aspergillosis) in Dogs

Aspergillosis in Dogs

Aspergillosis, a fungal infection caused by Aspergillus, a common mold found in various environmental sources such as dust, straw, grass clippings, and hay, is an opportunistic ailment in dogs. An “opportunistic infection” occurs when an organism that typically doesn’t cause disease infects a dog, exploiting the weakened state of the pet’s immune system and/or body due to another ailment.

There are two primary types of Aspergillus infection: nasal and disseminated. While both types can affect cats and dogs, they are more prevalent in dogs. Dogs with a long head and nose (known as dolichocephalic breeds) and those with a medium-length head and nose (known as mesatcephalic breeds) are particularly susceptible to the nasal form of aspergillosis, especially young adult dogs. On the other hand, the disseminated form of the disease appears to be more prevalent among German Shepherds. This medical condition can affect both dogs and cats.

Symptoms and Types

There exist two types of Aspergillus infections. The first type manifests as nasal aspergillosis, where the infection localizes in the nose, nasal passages, and frontal sinuses. It is hypothesized that this form develops through direct contact with the fungus via the nose and sinuses. For instance, exposure to outdoor environments containing dust and grass clippings may facilitate the entry of the fungus through the moist lining of the nasal passages. The second type of Aspergillus infection is disseminated, indicating a broader distribution throughout the body, beyond the nasal area. The method of entry for this form is not definitively understood.

Symptoms of nasal aspergillosis comprise sneezing, nasal pain, nosebleeds, reduced appetite, visibly swollen nose, and persistent nasal discharge, potentially containing mucus, pus, and/or blood. Additionally, some cases may exhibit loss of pigment or tissue on the skin’s surface.

Symptoms of disseminated aspergillosis in dogs may manifest suddenly or gradually over several months. These symptoms include spinal pain or lameness due to infection, as well as inflammation of the animal’s bone marrow and bones. Other nonspecific signs may include fever, weight loss, vomiting, and loss of appetite.


Aspergillosis stems from an infection caused by the Aspergillus fungus, commonly present in environmental elements like dust, hay, and grass. The nasal form of the ailment predominantly affects outdoor and farm dogs due to their frequent exposure to environments containing Aspergillus.

This condition operates as an opportunistic infection, indicating that an animal is susceptible to contracting Aspergillosis primarily when its immune system is compromised. Dogs with immunodeficiency, characterized by an inability to generate a normal immune response, face heightened risks of contracting the disease.


The diagnostic process varies based on whether the case involves nasal or disseminated aspergillosis. In instances of suspected nasal aspergillosis, diagnostic procedures typically entail analyzing nasal swabs, conducting fungal cultures of nasal discharge, and performing rhinoscopy—a procedure involving the insertion of a small fiber-optic scope into the nose to inspect its internal structures and mucus linings. Diagnosing disseminated aspergillosis is challenging due to the mostly nonspecific symptoms. Diagnostic tests may involve urine analysis and X-rays to assess the spine.


The treatment approach varies depending on whether the disease manifests as nasal or disseminated aspergillosis. In cases of nasal aspergillosis, the primary treatment option for dogs involves administering an antifungal medication directly into the patient’s nose and nasal passages while the dog is under anesthesia. Treating disseminated cases in dogs presents challenges and seldom results in a complete cure. Typically, antifungal drugs are prescribed to alleviate symptoms and potentially resolve the condition.

Living and Management

The ongoing management of aspergillosis hinges on the type and seriousness of the condition. Dogs afflicted with the nasal form should undergo regular monitoring to track any reduction in nasal discharge. Conversely, dogs with disseminated disease require periodic monitoring through urine analysis and X-rays every one to two months.


Prevention of aspergillosis involves maintaining overall good health to bolster the immune system against opportunistic diseases. Keeping dogs indoors can be beneficial as it restricts their exposure to environments containing substances like grass clippings, hay, straw, and other potential sources of the Aspergillus fungus.

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