Brainy Breeds

Question: Certain dog breeds seem to be smarter than others, so I purposely chose a Border collie in part because of the breed’s reputation for brains. I didn’t want to fuss with a less-intelligent breed when it came to teaching basic obedience. I don’t have the patience to keep trying and trying to teach a dog to sit or to stay. So far, I’ve been really happy with Einstein’s response to training, but I’m curious: How can I figure out just how smart he is?