I tell people it took him 7 months and 1 "click" to learn to lie down on command.

We spent 7 months learning different behaviors with the clicker, then one day he wanted to roll and I clicked and paid big.

He got up and down 6 more times to check to see if I would really pay him for lying down. (Of course I clicked and treated each time.)

He has been doing the trick on cue ever since and added
"sitting up" on his own.