There are more than 48.2 million dogs living in the U.S., according to a pet ownership estimate published by the American Veterinary Medical Association
The number of dog breeds in the world isn't exact and varies depending on each kennel club and governing body
In the U.S., the most popular dog breed is the Labrador retriever, and it’s held its first place spot on the AKC’s "Most Popular Dog Breed Full Ranking List" for 31 years
Scientists believe dogs first evolved from wolves about 130,000 years ago, which they’ve based on a published DNA analysis from 1997, according to PBS
The AKC says the average lifespan for a medium-sized dog is between 10 and 13 years, while the average lifespan for a small-sized dog is between 10 and 15 years
The world’s oldest living dog is a 22-year-old Toy Fox Terrier named Pebbles, according to Guinness World Records
The gestation period for a dog can range between 58 and 68 days (nine weeks)
The world’s tallest living dog is a two-year-old Great Dane named Zeus who has a standing height of 3 feet, 5.18 inches, according to Guinness World Records
The world’s smallest living dog is a Chihuahua named Miracle Milly who has a standing height of 3.8 inches, according to Guinness World Records
The estimated cost of owning a dog for 12 years can be between $5,000 and $20,000, according to an analysis credit.com put together