Supposed to be left-right interchangeable, but the hinge pocket is sewn in at a 30-degree angle for the right leg only. My dog’s injury is the left leg. I followed directions on the site which stated to simply flip the hinge in the other direction, but that made the hinge stick out at an unsafe angle for my dog because the hinge pockets are NOT straight up and down like the image shown here. Either that or they sent me the wrong one. Either way, their representative insisted that it was correct and I just had to follow the site’s directions, despite the fact that I sent her an image of the hinge next to the hinge pocket going in opposite directions. They refused to exchange or refund so I’m stuck with a brace I can’t use and my poor dog is still limping.