iv been told its nothing to worry about but im unsure, dog went to ground with first fox and got the usual bite on snout so cleaned it up and was fine apart from a bit of swelling then 3 days later he was in the house then his head started to wobble up and down, then stopped, 2 hours later it started again but i noticed its when he lowers his head to a certain point? any ideas or suggestions, also the dogs acting fine, ie drinking water, eating and solid stools