Of course you take your pet to the vet — but you've always wondered if you could do something more to keep him healthy. Track their days. Make sure they are getting proper rest and play. Set goals for their walks. Check in on them while you are away. That is where Whistle ($130) comes in. From monitoring day-to-day behavior to long-term health trends, Whistle is able to ensure you are doing everything for your best friend. It lives unobtrusively on your dog's collar, updating wirelessly to your phone (using Wi-Fi and Bluetooth connectivity) and sharing highlights of your pet's activities. With its waterproof construction and 10 days of battery life, Whistle is ready for anything.