Whoa, whoa, whoa, do you mean you've never had a pinch flat (neither have I, that I can recall - I think they're pretty rare when you're under 150 lbs)? Or you've never had a puncture, a leaky valve, any kind of flat????
Oh man. Never say never. The Flat Gods will visit you frequently. I've had one pinch flat & honestly - it had been two weeks since I'd aired up my tires & I was probably running about 80 pounds (I'm 118 pounds.)
To train a dog, you must be more interesting than dirt.