What's the smallest dog in the world? Meet Milly, who is just under 4 inches tall.
The many different breeds of dogs mean there's almost certainly a perfect dog for everyone. Those interested in smaller breeds can find a friend in breeds like Pomeranians or pugs, while those looking for larger canines might fall in love with Great Danes or Bernese Mountain Dogs, says the American Kennel Club.
According to Pet Keen, there are between 195 and 500 different dog breeds, based on different organizations’ recognitions and experimental breeds.
With all the possibilities, what is the smallest individual dog in the world?
What is the smallest dog in the world?
The world’s smallest individual dog, recognized by Guinness World Records, is Milly, a 1-pound Chihuahua born in 2011. Measuring 9.65 centimeters, or 3.8 inches tall, the tiny dog sleeps in a crib and only eats “food cooked by humans.” 
Just Curious?: We're here to help with life's everyday questions.
Why does my dog tilt its head?: Understand nonverbal communication
What is the smallest dog breed in the world?
The smallest dog breed in the world is a Chihuahua, ranging from 15 to 23 centimeters, or 5.9 to 9 inches in height, according to Purina, a pet food and care company.  Chihuahuas weigh between four to six pounds and can have shorter or longer fur depending on the dog.
The AKC explains Chihuahuas are “sassy pets” with “huge personalities” that enjoy quality time with their owners yet can be on the small side to be around rough children. 
Purina lists toy poodles as the second smallest dog, not exceeding 28 centimeters, or 11 inches in height. AZ Animals notes toy poodles often weigh between six and 10 pounds and can live up to 18 years.
What is the biggest animal in the world?: Largest whale, land animal on Earth
What is the biggest dog in the world?
The English Mastiff is the biggest dog breed in the world, says Purina.  A height of 27 to 35 inches and a weight of 200 to 230 pounds makes them great security, police, military and guard dogs.
Taking second place is the Irish Wolfhound. According to Purina, these dogs can grow up to 32 inches but are big teddy bears on the inside.
What is the biggest individual dog in the world?
The tallest individual dog in the world is Zeus the Great Dane. He stands at three feet and slightly over five inches tall and is a Guinness World Record holder. Zeus reaches seven feet and four inches tall when standing on his hind legs.
What is the biggest dog in the world? Meet Zeus, the Great Dane who set the record.
What is the oldest dog in the world?
The oldest dog in the world was an Australian cattle dog named Bluey who lived to the age of 29 years and 5 months. Bluey died in 1939, AZ Animals says, and she lived over double the average lifespan of her breed.
The oldest living dog as of 2023 is a chihuahua mix from Ohio named Spike, who turned 23 in January.
Meet Spike: New Guinness World Record for world's oldest dog
This article originally appeared on USA TODAY: What's the smallest dog in the world? This one is under 4 inches tall.
