What does your dog do when you’re at work? How much did he walk yesterday? What are his hopes, dreams, and desires? These questions (OK, maybe not the last one) and more can be answered with Whistle ($100), the on-collar device and app that measures your dog’s daily activities. You can keep tabs on Fido from your phone, share his memorable moments, and even send his health reports to your veterinarian. Pro Tip: Vets love pics of nude animals.