Dogs need to exercise and move to stay healthy. Taking your dog for a walk or two every day is nice. You should also track its activity to catch changes in behavior quickly. The Whistle Tracker is a handy tool that helps you better understand your dog. It collects data on your dog 24/7. Just attach it to your dog’s collar, and you are set. The companion iPhone app lets you go through your dog’s data on your smartphone. The Whistle tracker sets you back $99.