It's possible to be dominant and aggressive at the same time, but many people think that a dog is aggressive because it's dominant, and that is not true. Dominance aims at controlling another by means of ritualized behaviour, without harming or injuring another. The attack is motivated by aggressiveness alone.
Originally Posted by Kaz Tarja
There is a difference in terms agressive behaviour and aggressiveness. Aggressive behaviour aims at resolving or assisting conflict, while aggressiveness is the ability to show the aggressive behaviour and to attack, a drive triggered by competition. Aggressiveness is the drive directed towards elimination of competition.
Respect and you shall be respected. Animal is always right.