Bungee Dog Leash Extension Attachment,Dog Shock Absorbing Extension Leash Bungee Attachment,Improved Dog Safety,Great for Bicycle, Running, Walking(1 Pack M Size)

My large young dog is a runner and something to dilute trachea damage is really important. He absolutely won’t tolerate the kind of harness that has a front attachment that pulls to the side, which worked perfectly for our other dog. Oh well.This is working well and he is learning to sense the slight increase in tension that happens when this thing kicks in. I’ve coupled that with a verbal signal telling him he’s at the end of his leash. Overall he’s learning and I am feeling good about the overall effect.Before getting this, I tried a heavy duty double bungee cord kind of attachment, much shorter and much stiffer, and it didn’t really work.I should add that this extender is quite light, which I think is important. Other devices are heavy with huge heavy clips and the leash is weighted down. This one doesn’t have this problem.It doesn’t solve the problem the way a side-pull harness does, but it’s the best solution yet for a harness-aversive dog.And it definitely can be chewed through, at least partway (so far; hasn’t come apart). So we recently added one of the steel cable extensions which has made a big difference. But this extension plus the steel cable extension seem kind of heavy to me, but the dog doesn’t seem to care at all.I am however concerned about others’ reports of it losing elasticity.