Oh and I was wanting to add to the veterinary-human medicine thing.

The first guy to do a C-section worked with pigs and knew their organs well enough to take a baby out of his wife. She survived! The first ever C-section was done by a guy with no medical experience. For hundreds of years, human corpses have been off-limits (mostly due to the fear of disease and religious reasons) so animals were the bulk of practice. Animals and humans can also take a lot of the same medicine, like aspirin. A bladder in a rat looks like a human bladder, just teeny tiney. Same as the heart of a cat and human. Lungs of a horse and a human, except you could probably fit your head inside of a horse's lungs.

So, in short, it's not all that different, but there are some things that are very different of course, but a bone heals like a bone heals.