Final answer:
Aggressive behavior between dogs is classified as intraspecific competition, which is when members of the same species vie for resources and can involve intimidation tactics to avoid direct conflicts.
Step-by-step explanation:
Aggression between dogs is known as intraspecific competition. This type of competition occurs when individuals of the same species, such as dogs, compete for resources like territory, water, food, or mates. In the animal kingdom, aggressive displays, such as baring teeth, are often used to communicate an individual's willingness to fight and assess fighting ability to reduce the occurrence of fighting. Natural selection may favor even 'dishonest' aggressive displays if they succeed in avoiding actual combat.