My dog, Aku, is 10 months old male. He's very dominant, physically and mentally very powerful working line dog.
Now the problem is that he's very aggressive towards other young males. Older males are okay, for now. This hostile attitude happened quite fast, only some weeks ago he was playing cheerfully with his brother, but now he basically wants to kill him. I'm okay with the fact that he doesn't accept other males, that's expected, but what I don't accept is going totally nuts when around other males. He goes full retard, doesn't respond to commands anymore.
So the question is, how to stop this unaccepted behavior. So far I've just dragged him away and calmed him down without hurting him. It of course works for that situation, but he doesn't really learn anything. The breeder told me to slap him in the face or squeeze from the balls, cause him some real physical pain to stop it. He told me that if I'm not able to stop that aggression immediately now when he's only 10 months, how am I going to do it when he's 5 years? That's a very good question. So I'm now leaning towards "old school" and using real physical corrections.
I'd like to hear some opinions and experiences, please!