I've had a couple of dogs--both German Shepherd (GSD)s.
The first one, discovered the "Law of Bouncing" one day. He was just a puppy when I did this. I dropped a racquet ball in front him and he stared at the floor the whole time. The ball went up and the ball went down. You know, bounced. Well each time the ball hit the floor, his ears perked up and when it bounced up this ears went down. It was hilarious.
My second boy had a very large understanding of vocabulary because I spoke to him all the time. If I said "deer" or "moose," he knew what it meant. For some reason he really liked the word "poop."
Go figure...