Pet care industry spending exceeds $50 billion per year in the US alone, so there's no question that folks are dropping some serious dough on man's best friend. A device to track your dog's health, then, makes an awful lot of sense, from a business perspective at the very least. Whistle, designed by a company bearing the same name, keeps tabs on your pooch for 100 bucks. The device connects to your pet's collar; from there, it quietly measures activity and rest. The information i
