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Animals Are Good Animals Are Good cures await discovery. Although the list is pretty much endless, here are some examples, by decade, including the main species used that were crucial to the discovery: Pre-1900: Treatment for rabies (dogs, rabbits), smallpox (cows), anthrax (sheep). 1900s: Cardiac catheterization techniques (dogs, rabbits), treatment for rickets (dogs). 1920s: Discovery.