Dominant aggression in dog is usually directed towards another dog of the same sex.
It is much more of a problem in males than females, and is most likely to take place when the dog is on its own territory. Some dogs are simply unsocialized social misfits, but more often the problem is sex-hormone-related. Neutering at a young age reduces this behavior in most male dogs.
SIGNS OF AGGRESSION
You should intervene the moment your dog makes eye contact with a potential adversary. A raised tail and intense concentration are indicators that a fight might be about to begin.
A fierce challenge
Dominantly aggressive dogs mean business. On most occasions, fighting is preceded by aggressive body posturing and growling. Unless one of the dogs backs down, a fight will ensue. During a fight, a dog is likely to bite whoever intervenes – even its owner.
Between you and the dog
Some dogs will aggressively defend their owners. Standing between you and the other dog while pulling on the lead enhances the dog’s feeling of aggression. The dog will eventually associate the feeling of straining on a lead with aggression, while it may show no aggression off the lead.
Although you may instinctively try to keep the dog on a short lead when aggressive behavior begins, this will often exacerbate the situation. Forcibly pulling the dog back will increase its aggression. You should turn your dog’s head away, so that it cannot make eye contact with the other dog.
Train your dog to wear a muzzle. Not only does the muzzle physically prevent the dog from biting, it also diminishes the dog’s feeling of dominance. Take a positive attitude to muzzle-wearing, it shows that you are a responsible owner. Look around you when you are in the park; the safest dog is a muzzled dog.
Aggression towards other dogs can sometimes be related to a lack of early and continuing socialization with other dogs. This can be difficult to deal with, and you may need the help of behavioral expert.