This adorable little pup may not look like a fierce protector, but he clearly has the heart of a lion, and knows exactly when to use it.
When the unsettling noise begins, watch this dog’s reaction. He does not hesitate to go straight over to his new baby sister and provide her protection in this moment of imminent danger!
[youtube http://www.youtube.com/watch?v=YBQJcYvRO9A]source
