Tap tap! Tap tap tap tap tap!
I've written before about how I learned from an Animal Planet BBC program called Barking Mad that I could teach Diamond sign language to better communicate with him.
Since I last wrote about that, I've taught Diamond through the use of the thumbs up signal and treats that if he politely taps me on the hand or arm, he'll get a treat. It's the sign language equivalent of "Please may I have a treat, Mommy?" and it works. It's MUCH more convenient for both of us than a random YOWL in a public place. X-D
He's also learned "sit." We're still working on "come," and he hasn't figured out "stay" yet.