There are hundreds of different breeds of domestic dogs in the world, and the exact number may vary depending on how one defines a "breed." As of my last knowledge update in January 2022, the American Kennel Club (AKC) recognized 197 distinct dog breeds.
For example, some popular dog breeds include the Labrador Retriever, German Shepherd, Golden Retriever, and Bulldog. Each breed is characterized by its unique physical and behavioral traits. Additionally, there are many other breeds recognized by different kennel clubs and organizations worldwide, such as the United Kingdom Kennel Club (UKC) and the Fédération Cynologique Internationale (FCI), which further expand the total number of recognized breeds.
It's worth noting that new breeds are occasionally recognized, and some breeds may be specific to certain regions or countries. Therefore, the number of dog breeds worldwide may continue to evolve. To get the most up-to-date information on the number of dog breeds, it's advisable to refer to official kennel clubs and canine organizations.