I bought a cord harness and just tried it on Thor. She hated it. I thought ok well it's the first time she just needs to get used to it. But I'm not so sure. She was puffing her beard, dragging her body on the ground then started inflating herself like a balloon. I had just read about the member who's beardies lungs collapsed from puffing too much and I got worried. So I took it off. I'm too paranoid to use it now.