Dog aggression/fighting

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this dog might need some correction that will make a statement to him...but he is not a cull...
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Mr Reuben, for the sake of knowledge, what type of correction would you suggest for this? Since I've had this particular dog it has usually only taken no more than a stern raised voice to get him to comply. Only once or twice before have I ever had to get physical with this dog. On the aforementioned hunt, he got way more of a,"correction" from me than he has ever got before. I've only been working hunting dogs for 4 yrs, but handled schutzhund dogs many years before them. I was always told it was a no no to shock a dog agressive dog for fear of making it worse. But getting physical with him had no effect either. After the second fight he was growling even when there were no other dogs close to him. And if a dog got close it was on and it seemed he was pissed off at the world.

As mentioned before he's NEVER acted this way before. And I hope he never acts this way again. But I am open to all suggestions on how to deal with him should this situation arise again.