Hmm, Sammy paces a good bit. He's never shown any indication of orthopedic problems, other than periodic bouts of panosteitis, but I wonder if this is something I should keep an eye on. I'd say he's always done it, and he's just a year old now. Some of the tie, it could definitely be related to me pulling back against his leash, as that Web site mentioned. But I do wonder. In the picture of a dog "pacing" they mention how this gait makes the rear raise up higher than the shoulders, and this is definitely noticeable in Sammy. He only paces at slow speeds, and definitely moves into a trot when he's jogging along.