A San Francisco startup is marketing a wearable device for dogs that monitors canine health by crunching data on pets' activity levels. The device -- dubbed Whistle -- works in tandem with a smartphone application and can send health information to veterinarians. The device, which will cost $99.95 when it's introduced this summer, is one of a series of health gadgets for pets, including a collar sensor for cats, planned by the company.

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