LOL yup heard of them, and in yorkies of course you get to try to improve ear set by taking an ever so small piece of ear hair into the topknot to make ears stand up.
There are probably dental implants too.
Oh yes and how about surgically cutting tendon on dogs tail to insure that happy "erect" tail carriage.
Much more concerning (to me) is how handlers can and do exhibit the dog a certain way to cover up poor fronts rears, toplines etc.
Then there are the "tricks" handlers play to distract your dog or somehow put your dog at a disadvantage.
Now having said this, there are many many people in the show world, who do a whole lot of good and compete ethically. It is a competition, after all. Part of your responsibility is to train your dog to ignore treats that have been left on the floor, your responsibility to stack your dog in the most appealing way for his/her structure, your responsibility to make sure you don't get "buried" in the stacking set up. Your responsibility if an exhibitor is running to close up your tailbutt, to take evasive tactics, and or tell them to back off. This not so much in the toybreeds, but let me tell you it happens a lot in the working breeds. And this can be a very dangerous practice.
Let me tell just one teeny story. At a show couple months back, a pro handler I know was standing ringside (at the time I didn't know he would be showing a yorkie), so he has a small crate ringside on the floor. I'm waiting to go back in for judging of winners dog, he lets his small dog(not a Yorkie) out of crate, it somehow slips past him, and comes up to play with Razzle not once but twice!. Razz of course is nice and distracted by now. We get called back into the ring, we progress and win. Guess who shows up in BOB competition but that self same handler with a Yorkie. Was it an accident? hummm. perhaps | 