I'm holding the treat semi-out of sight between my hand held flat to my leg - this near his face. I'm hoping to gradually (as he grows taller) slide my hand up to my hip and then gradually around to my midsection.
The only time my hand comes away from my leg is when he forges or I see his butt going out.
When he's forging, I stop forward motion and lure with the treat or my empty hand while taking a step back with my left leg so he sets up in heel position again and we try again.
When his butt is going out I will put my hand with the treat on the outside of his face. This seems to straighten him up. I'm also luring when doing spins and left pivots.
Everything else, my hand is snug to my leg and the treat is out of sight - albeit the hand close to his face. <- I want an active/prancy heel, but I'm not interested in training him to heel doubled over backwards....
Even though my hand is right at his level, he's will leap every other step. That's with him looking up at me. <- I'm sure I encouraged this to a certain extent because I want him to focus on my face, but...?
Talking with my instructor and based on what I've personally seen as well - I'm concerned for getting knocked for an unqualified heel if my dog appears out of control. There are some dogs that I've seen whose feet barely touch the floor, and while they are in heel position and not bumping the owners, it looks a bit out of control.... o_O