My Jack Russell Terrier, k'Treva (yes I use her name as my online persona) was taught early on to sneeze on command. Of course, the poor thing would sneeze her little heart out whenever there were treats available. It was her favorite trick among many. Pity she's gone on to the Rainbow bridge prematurely. All my dogs have learned sit-up-pretty, shake, gimme five, high five (one does high ten, as well), a rather reluctant wave, and other things, but this was the most fascinating one, I think.