Which dog posture signifies aggression?

The posture that signifies aggression is characterized by hackles raised and intense barking. When a dog exhibits this behavior, it is often a sign that they are feeling threatened, defensive, or assertive. Raised hackles, which are the hairs along a dog's back standing upright, indicate heightened arousal or agitation. This response can also serve to make the dog appear larger and more intimidating to potential threats. Intense barking often accompanies this posture, serving as both a warning and a display of assertiveness. Recognizing these signs is crucial for understanding a dog's emotional state and ensuring safety in encounters.

Other options describe postures that indicate relaxation, calmness, or friendliness, which are not associated with aggression. For instance, tail wagging loosely while lying down suggests a non-threatening demeanor, and soft eyes with a relaxed demeanor indicate that the dog is at ease. Similarly, a dog sitting calmly without making noise also reflects a state of tranquility rather than aggression. Understanding these differences is key when interpreting canine body language and behavior.