You Won't Believe What Has This Boxer Terrified (VIDEO)

(Screenshot: Senyin/YouTube)

Leonardo is a healthy-looking boxer, a lean, muscular physical specimen designed to move with agility and speed. With strong jaws lined with a carnivore's teeth, he's a threat in any fight.

Yet the pooch seems to exhibit signs of some past trauma. Did he get caught in a thornbush as a puppy? Maybe he fell from a tree. Because there must be some reason he's terrified of that little thing on the window sill, a dried-up leaf.