Which dog behavior may indicate that it is feeling insecure and frightened?

Rapid panting can indeed indicate that a dog is feeling insecure and frightened. When dogs experience fear or anxiety, their physiological responses can lead to changes in their breathing patterns. Rapid panting is a common sign of distress, suggesting that the dog may be trying to cope with that fear. In contrast, other behaviors such as standing tall, having ears perked up and appearing happy, or holding the tail high generally indicate a confident or content state rather than insecurity or fear. Understanding canine body language is crucial for assessing a dog's emotional state, and recognizing when a dog is panting rapidly can help inform appropriate interventions to ease its anxiety.