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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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Amazon.com: Dogtra Pathfinder 9-Mile 21-Dog Expandable Waterproof Smartphone GPS Tracking & Training E-Collar with 2-Second Update Rate, No Subscription Fee, Free Satellite Map : Pet Supplies
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