Dog
Canis familiaris
Quick answer
The dog is a domesticated mammal and the most popular pet on Earth, descended from the gray wolf and bred into more than 340 recognized breeds. Dogs are prized for their loyalty, trainability, and bond with people, and most live around 10 to 13 years. They range in size from tiny Chihuahuas to giant Great Danes.
Dog facts at a glance
| Scientific name | Canis familiaris |
|---|---|
| Diet | Omnivore |
| Habitat | Domesticated, worldwide alongside people |
| Lifespan | 10–13 years (varies by breed) |
| Weight | 2–90 kg (4–200 lb) depending on breed |
| Top speed | Up to 72 km/h (45 mph) in greyhounds |
| Conservation status | Domesticated |
| Kingdom | Animalia |
|---|---|
| Phylum | Chordata |
| Class | Mammalia |
| Order | Carnivora |
| Family | Canidae |
| Genus | Canis |
Behavior and intelligence
Dogs are highly social, pack-oriented animals that bond strongly with humans and other dogs. They are unusually skilled at reading human gestures, expressions, and tone of voice, which makes them easy to train. The average dog can learn around 165 words and signals, and the brightest breeds can learn far more.
Breeds and diversity
Selective breeding has produced more than 340 recognized breeds, the widest range of body shapes and sizes of any land mammal. From the tiny Chihuahua to the towering Great Dane, every breed traces back to the gray wolf, shaped by thousands of years of human selection for herding, guarding, hunting, and companionship.
Dogs and humans
Dogs were the first animal humans ever domesticated, likely between 15,000 and 40,000 years ago. Today they work as guide dogs, search-and-rescue dogs, detection dogs, and herders, in addition to being beloved family pets. Their sense of smell is tens of thousands of times more sensitive than ours.
Health and care
Dogs thrive on regular exercise, a balanced diet, social contact, and routine veterinary care including vaccinations. Smaller breeds tend to live longer than giant breeds, and good nutrition and dental care can add years to a dog's life.
Frequently asked questions about the Dog
What animal are dogs descended from?
All domestic dogs are descended from the gray wolf. Dogs and wolves share around 99% of their DNA, but thousands of years of domestication have changed dogs' behavior, appearance, and ability to bond with people.
How long do dogs live?
Most dogs live around 10 to 13 years. Smaller breeds often reach 15 years or more, while very large breeds such as Great Danes tend to live closer to 7 to 10 years.
How many dog breeds are there?
There are more than 340 dog breeds recognized by the Fédération Cynologique Internationale, the largest international registry. National clubs such as the American Kennel Club recognize a smaller number, around 200.
Are dogs colorblind?
Dogs are not fully colorblind. They see the world mainly in shades of blue and yellow and cannot distinguish red from green, similar to a person with red-green color blindness.
What is the most popular dog breed?
Retrievers, especially the Labrador retriever and golden retriever, are consistently among the most popular and most searched dog breeds worldwide thanks to their friendly, trainable temperament.
