hi it could be. i would take him/her to the vet as soon as possible. ten years old in dog years is about 60 or 70 in our years so it could just be starting. the vet will do a thorough exam including x-rays. she may also recommend your "love bug" lose a few pounds. best wishes!
my dog is now 10yrs old and overweight. he has energy but lately has been limping everytime he gets up is it arthritis? . it's especially bad after he's been laying for any length of time. after he gets up and moving again it's still there but not as pronounced. he still runs around the backyard and doesn't show any kind of pain even if i handle the leg. it's always his front right leg.