I've basically defined both types of down for Tank.
"Down" is used when I want him to use the correct form.
"Break" is used when I want him to do the lazy hips down. Usually we'll use that when we're playing fetch and I feel he needs to take a breather because he won't do it on his own, or when we're watching TV in the house, or just anywhere where a proper sit isn't absolutely necessary.
I don't have him at 100% yet, more like 90%, but we're working on it.
Ravel Vom Leineholz aka Tank (9/8/2011)
"You cannot dream yourself into a character; you must hammer and forge yourself one."