most diseases that affect dogs or humans are not transferable between the two species. diseases that can be transmitted from animals to humans are termed zoonoses. a well-known zoonosis is rabies, a viral infection transmitted through a bite. a common bacterial zoonosis is leptospirosis, transmitted through urine. some of the most important zoonoses are parasitic. zoonotic intestinal parasites transmitted through contact with feces include "toxocara canis" (the canine roundworm), which causes toxocariasis, visceral larva migrans, and ocular larva migrans, and hookworms, which can cause cutaneous larva migrans. zoonotic skin parasites include scabies, caused by the mite "sarcoptes scabiei". the most common zoonotic fungal disease is ringworm, caused in this case by "microsporum canis".