Cutaneous fungal organisms produce circular, white colored areas of alopecia over the body surface. It often produces a moth eaten appearance on the skin. Most of them are not pruritic but animals may lick at the lesions.
Systemic fungal infections cause clinical signs in the organs they reproduce in.
1. Blastomycosis: Most animals develop signs of respiratory disease that can lead to pneumonia. Other organs may be associated with the disease hence other clinical signs.
2. Aspergillosis: Aspergillosis is a yeast organism that causes nasal respiratory disease in animals. A muco-purulent discharge, bloody nose and sneezing are very common in most animals.
3. Cryptococcosis: The majority of dogs will show clinical signs of respiratory disease including pneumonia and coughing. Neurological signs such as seizures, head pressing plus ataxia are common.
4. Coccidiomycosis: Minor respiratory signs and pneumonia may be seen or nothing at all. In severe systemic infections clinical signs involving the bone, liver, spleen and others are noted.
5. Histoplasmosis: The majority of individuals do not show any clinical signs but will have an antibody titer to the disease. Some animals will demonstrate signs of weight loss, vomiting and diarrhea.