There are hundreds of different breeds of dogs, which can be categorized into several groups such as Sporting, Hound, Working, Terrier, Toy, Non-Sporting, Herding, and Mixed Breed dogs. Each breed has its own unique characteristics, temperament, and physical traits. Some popular dog breeds include Labrador Retrievers, German Shepherds, Golden Retrievers, Bulldogs, Beagles, Poodles, and Chihuahuas, among many others.