Get your hackles up

The phrase "get your hackles up" refers to becoming defensive, irritated, or angry in response to a particular situation or comment. It often implies a defensive reaction characterized by raised emotions, including feelings of agitation, protectiveness, or resentment. The term originates from the physical reaction of animals, especially dogs and cats, when they feel threatened or provoked. Their hackles, the hairs on their neck and back, rise as a response to perceived danger or aggression. Similarly, when humans get their hackles up, it signifies a defensive response to a perceived threat, insult, unfairness, or challenge.