I miss mine so much. Had to put her down 3 years ago.
They are super smart dogs. As others have mentioned they are loyal. I mean crazy loyal.
Years ago I used to run a small crawfish farming operation with my grandfather. I would drive my truck over to his place to get his 4x4 to go down to the fields to start work. Every day I would come back about 6 hours later and there she was. She would make the trek up the gravel road and be waiting underneath my truck waiting for me to get back.
As far as smarts go, if you keep toys in a particular location and they see where you go get it a few times, they will pick up on that and sometimes get the toy for themselves and even put it back when they are done.
Mine would always pull her ball and frisbee out of the basket and then I found her a few times dropping it back into the toy basket.
Awesome dogs and as soon as I'm able to find a place out in the country where I have land for one to play on, I'm getting another one.