"Bees knees", I've heard of Greko, but "Dog's knees"? - with dogs it's normally another part of the anatomy that is considered an indication of high quality...

.......

"a tuner... makes your ear 'lazy'"

Can work the other way - it can educate your ear to recognise when something is out of tune. I'm sure I'm more likely to notice when one or several of my strings have gone out of tune since I started using an electric tuner.