Penny and I go to our second class tomorrow and I am supposed to have the "sit", "down" and loose leash walking down. Ha! I, or rather Penny, has the "sit" command down as long as I am in a chair and not on the floor with her.
She absolutely will not lay down for me. And loose leash walking is a complete joke! LOL
The trainer said that for those little dogs that don't have to lay down to get the treat after the sit position, to go to the bathroom with about 20 treats and shut door.
Once the dog gets bored and lays down, say "down" and throw them a treat that makes them get up to get the treat. Keep doing this and she says eventually they will connect the "down" command to them laying down.
Well, not today, but maybe some day.

By about the 14th time, she realized that I had more treats and just wanted to dig the treats out of my hand instead of laying back down.

She is too smart for this mama.