he must have been like it since a young pup then,? its temp does change as they mature up to 2-3 years old, but nervous temp is normaly is there from a young pup.My self have probs with nervous+sensitve temps, i dont like it and it puts me off the dog, some people can handle it , but i struggle with it.! If you happy with the dog and what it does in the field ok, but as your not hunting all the year, and you got spend alot of time with them, you really got to get on with it .?
im the same mate nervous dogs drive me mental cant handle them