Blastomycosis in dogs is a systemic fungal infection caused by inhaling spores of the fungus Blastomyces dermatitidis, which primarily affects the lungs but can spread to other organs. This disease is most common in the eastern United States, particularly in areas near rivers, lakes, and wetlands.
The fungus thrives in moist, acidic soil and releases spores that become airborne when disturbed. Dogs inhale these spores, which then travel to the lungs and replicate, forming granulomas (small nodules). The immune system attempts to contain the infection, but the fungus can disseminate through the bloodstream, affecting the skin, eyes, bones, and central nervous system.
Blastomycosis presents in different forms depending on the organs affected:
| Type | Primary Symptoms | Commonly Affected Organs |
|---|---|---|
| Pulmonary | Coughing, difficulty breathing, lethargy | Lungs |
| Disseminated | Skin lesions, eye inflammation, lameness, neurological signs | Skin, eyes, bones, brain |
Disseminated blastomycosis is more severe and often requires aggressive treatment.
Veterinarians diagnose blastomycosis through a combination of physical examination, imaging (X-rays or CT scans), and laboratory tests such as antigen tests or fungal cultures. Treatment typically involves antifungal medications like itraconazole or fluconazole, which may need to be administered for several months. In severe cases, hospitalization and intravenous therapy may be necessary.
Another misconception is that blastomycosis is contagious between dogs or. While the fungus itself is not directly transmissible, both dogs and humans can independently contract it by inhaling spores from the environment.
Preventing blastomycosis involves minimizing exposure to environments where the fungus thrives, such as damp, wooded areas. Regular grooming and keeping your dog's living area clean can also reduce the risk of fungal infections. If your dog shows symptoms of respiratory distress or unexplained skin lesions, consult a veterinarian immediately for proper diagnosis and treatment.