Animals and humans get the same diseases; we even like to get high.
A century or two ago, in some rural communities, animals and humans were cared for by the same practitioner. And physicians and veterinarians both claim the same 19th-century doctor, William Osler, as a father of their fields. However, animal and human medicine began a decisive split in the late 1800s. Increasing urbanization meant that fewer people relied on animals to make a living. Motorized vehicles began pushing work animals out of daily life.