Quite frankly, Sally, Harry's a smart boy! I am not surprised that Harry can explain his wishes so well. He IS a Yorkie!
It is US who must learn to understand them. It takes US their lifetime to teach them everything we want them to know...they are much faster at teaching US what THEY want us to do for them! Or, at least that's how it works here.
I have always 'consulted' my fur babies...cats and dogs...and they always indicate what THEY want. My cat's have personally selected their desired cat food flavor by a number of gestures...Brody and Mia will even select the clothes they want to wear.
However, it might not hurt to have a Yorkshire accent well practiced...an 'ace in the hole' for us 'mericans for those difficult Yorkie understanding days...like when we say "no" but they don't quite get it? I'm assuming you'll teach me, too?