Yesterday it would seem our japanese spitz 11 year old male who is ideal weight. Slightly under if anything appears to have arthritis attack him as a rapid onset, unless he has had a stumble Sat night we are unaware of, he seems to be frail but improves as day goes on(warms up) he wimpers if we try and touch and cries when he gets up or down a step, he still wants to follow me around and wont rest