While common wisom has it that owners should never let their dogs run free, there are times when you’re not away of your little pooch being smart enough to unlock its cage, scurrying away to have some fun on its own accord. The Retrieva GPS Dog Tracking Collar ensures you will be able to get your pet’s current location in a snap, since the collar will be able to notify you via SMS whenever it travels outside a pre-defined safe area, courtesy of an integrated SIM card. Other two technologies used to alert you of your dog’s whereabouts include satellite and radio frequency.