I usually take my dobes for a walk using a reg. flat collar or a choke chain, but I have to take one, then come back and take the other one. After a 45 min walk, I dont always feel like going again for the 2nd round, but if I try to take them both at the same time, they think they are a team of horses (or hard-headed mules, more like it) and both will pull me, or spend the whole time together wrestling each other on the end of their leashes! Today, I put a GL on each of them, and we walked together for over an hour--no pulling, no fighting, no wrestling! It was VERY enjoyable!! I have to keep one on the right and one on the left, because they are a little jealous and have that "daddy likes ME best" thing going, but it worked out perfectly. Both of them thought they were my favorite, cos each one was close to me! If the weather is nice tomorrow, we'll do it again!