Dogs and puppies are susceptible to a variety of bacterial and viral infections, some of which can be fatal, but prevented by vaccinations. Learn more about the transmission, symptoms, treatment, and prevention of these diseases.

Fungal infections in dogs and puppies include skin infections such as ringworm and deep fungal infections such as blastomycosis. The diagnosis, treatment, and prevention of fungal infections are discussed in the following articles.

Protozoa are one-celled organisms which can infect many organs of the body. Treatment of protozoal infections is often different from treatments of other parasitic infestations.