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Martingale

A flat collar, worn around the dog’s neck, which has two loops. The first loop is fitted around the dog’s neck, and the leash is attached to the second, smaller, loop. When the dog tries to pull his head out of the collar, tension on the least makes the small loop pull tight, which makes the large loop smaller around the neck.

When correctly fitted, the martingale does not choke the dog, but it does make it more difficult for the dog to slip out of the collar and allows the collar to fit more loosely and comfortably around the neck.