A rousing game of fetch is more than just a great way to bond with your dog. Not only does it possess health benefits, it can help change the way your dog thinks. No, really! When you train your dog to catch and return a tennis ball, you’re improving their brain function through stimulating games. Through trial and error, he acquires the cognition to retrieve that ball, and you have a smarter, happier pet on your hands. Without challenging a dog’s brain in this way, you risk your dog becoming bored. That doesn’t sound like such a big deal … at first. But remember, when people are…