We have a 8 year old Pembroke Welsh Corgi. He has develeloped a sort of tick, where he has quick movements of his head with simultaneous blinking of his eves. It is not constant but occurs a few times a day. The Best example I could draw a parallel with is a momentary "Shiver" as in a chill. He is a bit overweight , has very fluffy coat, treated for Flea with a once-a-month external application called FrontLine or Advantage.No behavioral problems and othwise perfectly normal Dog. Is there a enough here to eliminate or generate a need for concern?