So I have a client with three miniature poodles that board with me from time to time. One of them has had eye issues for quite some time. The ducts in her eyes did not produce tears or were blocked somehow, either way the owners had to put lubricant in the dog's eyes in order to prevent some serious dry eye.
Well, imagine my surprise when the dog shows up today and the only medication she has is an oral antibiotic. So I asked if they had forgotten the eye lubricant and, if so, I could get some more for them. Turns out the dog doesn't need it anymore. Why? Because the owners had salivary glands transplanted and placed into the ducts in her eyes.
It gets even cooler...when I feed the dog, she cries. It's Pavlov's response in her eyes! So weird, but so cool. (Yeah, I'm a dork and I am amused/fascinated by weird stuff.)