Dogs With Raised Hackles: What Does It Mean? Raised hackles in dogs mean they are on high alert. They could be having a response brought on by fear, dominance, surprise, insecurity, or uneasiness about a situation. The nervous system automatically causes piloerection along the neck and back.

Do hackles always mean aggression?

Raised hackles, the hair on a dog's back and neck, confuse many pet parents. They may see them as a sign of aggression, but that isn't always the case. ... Raised hackles could be a sign of fear, anxiety, excitement, nervousness or anger.

Why do dogs bristle up?

What does that mean?” When the hair on a dog's back goes up (technically called piloerection), it's usually a sign that the dog is aroused, fearful, startled, stimulated or excited in some way. ... While sometimes aggressive dogs do exhibit piloerection, it is not true that it's necessarily a sign of aggression.