Country Brook Design Martingale Collar
I love martingale collars. They are sheer genius. The two ends of the larger loop are connected with a smaller loop. When adjusted correctly, then the dog pulls, the smaller loop extends, which pulls the larger loop smaller. Once the ends of the larger loop touch, it doesn’t close any further. This prevents it from choking the dog, while creating a loop small enough that the dog cannot pull out her or his head. I recommend having a larger width for larger collars, so that the pressure has more surface area to be spread out across. This prevents slipping of the collar without the choking.
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