Hi, all. Wondering if anyone has experienced anything like this with their sheltie. Fasb developed a leg twitch last summer. Sporadically, his back legs twitch (vibrate, like a human tapping their foot on the floor uncontrollably). It only happens when he's standing still on all fours. Doesn't occur when he's laying down, sitting, moving, etc. It's not always the same leg. We see it most often in the right leg/hip, but also see it in the left. It doesn't happen in both legs at the same time. It's difficult to be absolutely sure with a sheltie, but it doesn't seem to bother Fasb. He pays it no mind at all and gives no sign he's affected or in discomfort. It's not affecting his mobility. If he wants to hop up and run, he moves. No problems using the leg or moving into a running posture. We've asked our vets about it. Neither was particularly concerned. First vet never actually observed the twitch, but thought it was probably related to his arthritis. We changed vets last summer. Current vet has seen the twitch examined Fasb, and thinks it's largely behavoral - i.e., something he's started doing when he gets excited. He doesn't think it's anything to worry about. He did seem to rule out arthritis or a hip condition. He concurs that it's not affecting Fasb's movement at all (if it was arthritis or hip problem, Fasb would have problems running/walking/etc.). I don't quite buy his 'behavioral' explanation (the problem seeming only started last year in an eleven year old dog), but it does seem like we notice it more after Fasb gets excited. We don't see the twitch much when he is indoors - mostly outdoors. We also notice it more on days something usual is going on - a trip in the car or something similar. Notice it more in warm weather than cold - possibly because he is outside more? Doesn't happen all the time - or even every day. Some days we see it here or there, some days we don't. Considering how much time he spends on his feet, it occurs fairly seldom, really. I haven't noticed it since last Friday, when he went to the vet for an Adequan shot. Could it be age related? Fasb is eleven years old, in decent health. He has mild to moderate (vet's term) arthritis, which only last year became noticeable enough to treat. Last summer, he was limping for a few seconds and having trouble with steps. We put him on Cosequin DS and visible symptoms mostly cleared up. He also gets an Adequan shot every other two months to hopefully slow the progression of the arthritis. No other health issues of note. Thought? Like I said, the vet is sure it's nothing to worry too much about, but I'd like to know more before I stop worrying. Seems to be a very minor issue now, but I'm concerned it could become more of an issue later. Thanks.