Illnesses Dogs Can Get From Humans. The most common way for dogs (and humans) to contract giardia is by drinking contaminated water, though the parasite can be present in food as well. Dogs are ten times more likely to be infected than humans.
Humans can contract the parasite through direct and indirect contact with infected dogs, for instance, by handling infected dog feces, or. Dogs transmit several viral and bacterial diseases to humans. The symptoms in dogs have not been as severe as those in humans.