My Scout (age 11) has a noticeable limp on his right leg when he walks; he seems to not be putting his weight on it. Sometimes when turning he makes a sort of half hop. He hesitates jumping in the car or walking up steps. When he gets up from napping he takes a long time to get his balance. The limp is very noticeable upon waking, but gets less noticeable with use. When standing for long periods, he sometimes just lifts that right foot ever so slightly so it's not touching the ground. It came on very suddenly about two months ago. If there was an injury, I did not witness it. He does not get on furniture. He is generally in good shape, is at an ideal weight. Has been taking Soloxin for thyroid about three years, taking eye drops (like Restasis) for dryness for longer. Changed to a low fat Hills Science Diet around Christmas time to keep triglycerides in check. He had a full hip x-ray about two months ago with nothing remarkable, not even any signs of arthritis. Have had two different vets do a physical examination from the tip of his toes up to his hip putting him through a full range of motion and he shows no resistance to any movement in any direction, no whimpering. The only abnormality they can detect is a slight atrophy of the muscle in the right leg. Started over-the-counter Glucosamine and Chondroitin for about two months ago on the vet's advice, but no apparent affects. Started Rimadyl ten days ago, one dose a day with no effect, was this morning advised to bump up it to two doses a day. FWIW: 1. For all his life he has been antsy about having his feet touched. I am a very hands-on owner, very cuddly with my dogs, and this is the first one to ever show resistance to having his feet touched. It's been that way since he was a pup. 2. I travel a lot for my job and I used to board him with a very reputable kennel, but he would come home absolutely worn out and sleep non-stop for two days. And, often show sings of lameness so much so that I'd take him to the vet. The vet ran a series of tests as this recurred several times and found nothing and eventually decided that he simply played too hard when boarded. The kennel owner confirmed that he ran around and barked non-stop. Found another boarding alternative (a neighbor who would keep him in her home) and he came home from that boarding in perfect condition. So, no more kenneling. 3. Once or twice a year he will lick his right foot obsessively until it is pink, the vet will treat it with a shot (steroids?), he will stop licking and it will heal just fine. But it is the same foot as he is limping on now. The vet believes it is probably an allergy, but it's odd that it doesn't always happen at the same time of the year (same season). Our regular vet is stumped. This morning she started mentioning other alternatives--acupuncture, referral to an orthopedic specialist (my vet has an orthopedic guru of the practice, who we saw once, she found nothing other than the slight muscle atrophy). I'm wondering if any other Sheltie owners have unexplained lameness limping problems. I'm convinced there is some underlying something that he's had all his life with his legs, and that 25 years or so from now someone is going to do a study and "discover" it and give it a name and that we are just dealing with someone no one has "found" yet.