Which of the following is a common behavior of an aggressive dog?

The behavior of growling or snarling when approached is a common indicator of aggression in dogs. These vocalizations are often signals that the dog feels threatened or is trying to assert dominance, which can escalate to more aggressive behaviors if the perceived threat approaches closer. This type of communication serves as a warning, indicating that the dog is uncomfortable with the situation or the presence of a person or another animal.

In contrast, barking excitedly usually indicates a dog is happy or eager rather than aggressive. Cowering in a corner typically suggests fear or submission, not aggression, as the dog is trying to make itself smaller and avoid confrontation. Leaping toward a handler can signify excitement or playfulness, but not necessarily aggression; it can also indicate a lack of impulse control. Each of these behaviors reflects different emotional states in dogs, making growling or snarling a clear indicator of aggression.