What behavior might indicate a dog is feeling protective over a person?

The behavior indicating that a dog is feeling protective over a person is characterized by a stiffened body and focused growling towards perceived threats. When a dog takes this posture, it typically displays signs of alertness and readiness to defend its owner or territory. The stiffened body suggests tension, while focused growling can act as a warning to potential intruders or threats, signifying that the dog is prepared to intervene if necessary. This behavior is instinctual and reflects the dog's protective instincts, showcasing its role as a guardian.

In contrast, wagging its tail vigorously is often associated with happiness or excitement rather than protectiveness; a peaceful sleeping dog shows comfort and trust, not a protective stance; and jumping excitedly when approached typically indicates friendliness or eagerness for interaction, rather than readiness to protect. Each of these behaviors reflects a different emotional state or reaction, distinct from the focused and alert demeanor a protective dog displays.