Here is the reality,most hunting dogs are mostly companion dogs and 30% hunting dog ,are not used nearly enough to burn all that excess energie off on a daily basis and most dog qwners don't spend enough time training their dog, period,add to this mixture a dog that is intact...frustrated,underworked and oversexed...how is he going to release his frustration---agression.
Within the first 2 years you'll see what the dogs makeup is and if he ain't a superstar(Breeding material),do the world a favour and neuter him (unless you work the dog every day and keep him at a level where he is manageable).
Rainer