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SportDOG - GPS Tracker and Training Collar for Dogs and TEK Series 2.0 Locating System, Ideal Hunting - 10 Miles Range : Amazon.co.uk: Pet Supplies
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Amazon.com: Dogtra Pathfinder Mini GPS Electronic Dog Training Collar for Small to Medium Dogs - 4-Mile range, 100 Levels Nick and Constant Stimulation, Tone, Waterproof, Expandable to 21 dogs, w/ PetsTEK Clicker :
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