Broke within 6 months

Great concept but I bought 2 of these the last 2 years and both broke within 6 months. Both times the one stopper broke, which caused one dog to be able to stay on a short leash when we needed it, but the other would run off, so we have to hold the loose leash with our hand. My dogs are small Boston Terriers, 10 and 12 lbs.

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