Dogs are domesticated mammals known as "mans best friend" due to their unwavering loyalty and companionship. Descended from an ancient, extinct species of wolf over 15,000 years ago, they were the first animals to be domesticated by humans. Today, there are hundreds of diverse breeds—ranging from tiny Chihuahuas to giant Great Danes—each with unique physical traits and temperaments. Beyond being beloved household pets, dogs serve vital roles as service animals for the disabled, search and rescue helpers, and protectors. Their incredible senses, including a sense of smell at least 40 times more sensitive than a human's, allow them to navigate the world in ways we can only imagine.