Leash won't make my dogs any better behaved

It looks like a quality product but my dogs are just not well behaved enough to take advantage of it. One of my dogs is constantly trying to play with the other and this just prevents the other dog from escaping. They also like to go different directions a lot. It seems to hold up to two 100lbs dogs well though. I just have only used it twice since getting it because it isn't practical for my dogs. So I am back to one dog off leash and one on.

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