A martingale is a type of dog collar that provides more control over the animal without the choking affect of a slip collar. They were designed for dogs with necks larger than their heads as they can often slip out of buckle collars.
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For more information about these collars click here:
https://www.rover.com/blog/martingale-dog-collars-how-to-use-them-and-which-are-best/