A pet dog's specialty is its unconditional love, loyalty, and companionship. They provide emotional support, security, and even health benefits like reducing stress and encouraging physical activity. Each breed has unique traits, but their ability to bond with humans makes them special. Dogs have more rod cells than humans (which function better in lower light), and they also have a layer of eye tissue that humans lack called the tapetum lucidum. This reflects light into the retina and boosts dogs' night vision. It also explains why dogs' eyes seem to glow in the dark!