That is odd. Kia's doing this every time you walk? How old is Kia now?

I've noticed Star dragging behind once in a while, usually when we leave the dogpark, and I figure she's just not in any hurry to get into the car. I've already decided to take her for one leisurly walk a day, and then bring Sherman on another quicker-paced walk. But there's also 6 yrs. difference in their ages, which may account for some ot her slowing down.

Have you checked between the pads on Kia's paws for signs of trouble? Star had that growth on her pad, and I think it was annoying enough that she didn't want to be hurried. It was removed a couple months ago, she seems perkier now.