In the United States, there are more than 48.2 million dogs, according to a pet ownership estimate from the American Veterinary Medical Association.
The number of dog breeds in the world is approximate and fluctuates based on each kennel club and regulating organisation, ranging from 200 to 500.
The Labrador Retriever is the most popular dog breed in the United States; it has occupied the top spot on the AKC's "Most Popular Dog Breed Full Ranking List" for 31 years.
Based on a published DNA research from 1997, scientists assume that wolves and dogs initially diverged roughly 130,000 years ago.
A medium-sized dog's typical life span is between 10 and 13 years, whereas a small-sized dog's average life span is between 10 and 15 years.
According to Guinness World Records, Pebbles, a 22-year-old Toy Fox Terrier, is the oldest living dog in the world.
Zeus, a two-year-old Great Dane, is the tallest dog in existence with a standing height of 3 feet, 5.18 inches.