Track and search is very stimulating for a dog. One third of a dog's brain works with interpreting different scents. When a dog finds a track, signals are sent between the mucous membrane and the brain. This is really brain training for a dog. The dogs scent is so amazing that it's a shame not to try tracking. I train a lot of tracking with Tyra, I hope to train her as a rescue dog. I train with Norske Redningshunder (Norwegian rescue dogs). The site is also in English if anybody is interested. I recommend strongly this kind of training. You don't have to train the dog to be a rescue dog, but same kind of training is extremely stimulating for the dog. I love to watch Tyra while she is working. She is just made for search and track.