A very smart person on a goat health forum I belonged to used to say this, and I always remembered it. She could diagnose most any problem. Although I'll have to admit, one of our goats did have a very rare condition, even according to the vet school here.
@Joe Riley , when I look at this one way, I see a zebra facing one way. Then when I blink my eyes, it's another zebra facing another way. Fun!