It is now widely accepted that, in situations of aggression between cats in the same household, aggression can be manifested not only in active aggressive behaviour but also in a more passive manner through strategic use of marking behaviours such as [[Indoor Marking - Cat|indoor urine spraying]]. Passive aggression is therefore a differential diagnosis in cases of indoor marking. | It is now widely accepted that, in situations of aggression between cats in the same household, aggression can be manifested not only in active aggressive behaviour but also in a more passive manner through strategic use of marking behaviours such as [[Indoor Marking - Cat|indoor urine spraying]]. Passive aggression is therefore a differential diagnosis in cases of indoor marking. |