About a year ago Frodo had an episode when all of a sudden he couldn't turn his head to the left. He also walked with his head hung like he couldn't lift it. Since then it happens every few months, sometimes once or twice a month (always on left side). It will last anywhere from an hour to the longest which was 5 days. It goes away as suddenly as it appears. We took him to the vet and by the time we were seen it was gone. The vet did all kinds of manipulations on his neck and shoulders and he had no pain. She had no clue. She didn't think it was any kind of disc problem because he showed no discomfort or pain. The last few times it's happened I usually ice his neck down then apply heat with blow dryer and its gone within a few hours. Does anyone know what this could be?