No, it means "I'm a working dog". So, you better make him a working dog. It would be easy to make him ball mad and use a ball as a major tool in your training, because he would do anything
you ask him in order to get the ball. The best bouncing ball to start training is this Chuckit Dog Ball | eBay
. After a while you will find that you can open it and place a scent inside it. Chuckit ball doesn't have any smell of its own, thus, with placing a scent into it you can train your dog to look for it with association to the scent. That is how the sniffer dogs are trained, they don't search marihuana or explosions, they are sniffing in order to find their ball. You can also get a glow ball for your night play.