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A type of collar that involves a chain, where when you pull the leash it tightens up. That chokes the dog so they're more inclined to listen to you instead of getting choked again.

3OH!3 are fond of this device, as it helps then control their Pit Bull Lane.
I got a chokechain, ch-ch-chokechain.
by Officer #doubleoheleventeen June 21, 2009