Also is the intensity of the attack. My analogy would be if I pulled into a parking lot one day and somebody steals a parking place from me. I'm furious and mutter curses and shake my fist at someone but in the overall scheme of things in my life, it's a minor event. This does not mean I'm going to the parking lot with a gun and shoot someone. And they do it again this time.
Intact males are more likely to exhibit dominance aggression than neutered males or females.
It is more likely that this is controlled by androgen since females who show aggression before puberty and who are spayed become more aggressive. Dominance aggression and protective aggression are the number 1 and number 2 causes of treatment by behaviorists. From the description behavior, it might be possible to rule out actual interdog aggression. The dog is challenged by a stare or a bump or body block, and then each dog behaves in reaction to what the other dog did. A characteristic of interdog aggression is that aggressive intention is not displayed to other animals.