Play aggression is covered here . Territorial aggression can occur towards cats outside of the home, but also towards cats that live in the household. This may be with the addition of another cat, or when resident cats reach social maturity at 1-2 years of age. Since the person or other animal entering the property may also be causing fear or anxiety, territorial aggression often occurs in conjunction with fear aggression. Treatment on territorial aggression is covered here .
Predation is the instinctive desire to chase and hunt prey.
Predatory behaviors include stalking, chasing, attacking, and ingestion of prey animals, but may occasionally be directed at people or other pets. Although the desire to chase can be reduced by using desensitizing and counter-conditioning in the presence of the stimuli, this is a very dangerous form of aggression, which must be prevented. If the behavior is directed toward small pets in the home, confining those pets to a room where the cat does not have access is best. If the behavior is directed to animals outside, then keeping the cat indoors is a solution. Predatory aggression may be part of play aggression in young cats.