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Amazon.com : Hartz UltraGuard Flea & Tick Collar for Dogs and Puppies - 26" Neck, 7 Month Protection : Pet Flea And Tick Collars : Pet Supplies
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Amazon.com : Seresto Flea and Tick Collar for Dogs, 8-Month Flea and Tick Collar for Large Dogs Over 18 Pounds : Pet Flea And Tick Collars : Pet Supplies
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Hartz UltraGuard Flea & Tick Collar for Dogs and Puppies, 7 months Protection, 1ct - Walmart.com
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