Whenever we got a new toy for her we just had to throw it saying its name a few times and she would know it from then on.
We weren't able to train her on most stuff but her toy game was clutch.
Oppositional Defiant Disorder is just native behavior to some breeds...
One example that comes to mind is planting new grass seed on the lawn, and she was not allowed in the grass. She pretty much instantly figured out the new rule, but would constantly test it. Drop her ball a foot into the grass, then lay down on the sidewalk and crawl into the grass keeping her hind legs on the pavement. Still on the sidewalk!
It's a constant battle of wits trying to keep her from figuring out new "loopholes" or grey areas we don't anticipate. Also finding her "jobs" to do so she doesn't make stuff up on her own.
You can apply this to pretty much anything and if they're somewhat clever they can do it. Age doesn't seem to matter either, I've done this with 10 year old dogs too.
I like them, but would probably never own one unless I'll ever own and regulary use a dog sled.