Dogs are known as man's best friend due to their loyalty and companionship. They belong to the Canidae family and have been domesticated for thousands of years, serving various roles such as pets, working animals, and service animals. There are numerous breeds of dogs, each with unique characteristics and temperaments. From the playful Labrador Retriever to the protective German Shepherd, dogs come in all shapes and sizes, making them suitable for various lifestyles and families.