Both our pups have their own clips that we attach to their harnesses. Our one dog could care less that she is holding her poop, the other gets offended BUT since we can clip it to his back he has slightly less of a problem. So for their intended purpose, it is GREAT. Yesterday both the pups had a vet appt and needed a stool sample, so off on our walk we went. When I realized that I could just attach their own TO them and not worry about mixing them up I was SO excited. And then when it came time to go to the vet, it was still attached to their own harnesses. So nothing got left behind, I didn't need to hold it, and I didn't need to track whos was whos.
The vet techs also got a kick out of it. A very unexpected bonus that I am now fully convinced everyone needs one of these, especially if you have more than one dog going to the vet on the same day.