Wildlife Guide · Pakistan & Indonesia

Dog

Canis lupus familiaris (Linnaeus, 1758)

The first animal we ever tamed — and still the world's most popular companion.

Domesticated — Not Evaluated (IUCN)

A friendly mixed-breed (mongrel) dog with a white-and-ginger coat, photographed outdoors

Image: Photo: Jakub Hałun / Wikimedia Commons (CC BY-SA 4.0)

In brief

A dog (Canis lupus familiaris) is a domesticated mammal descended from the grey wolf, kept worldwide as a companion, working, and assistance animal; it is the same species across every breed, from the Chihuahua to the Great Dane.

By the WARN Research & Conservation TeamChecked against IUCN Red List & CITES sourcesLast updated June 2026

The domestic dog (Canis lupus familiaris) is a domesticated descendant of the grey wolf and was almost certainly the first species humans ever tamed, tens of thousands of years ago. Today there are roughly 900 million dogs worldwide, ranging from the toy-sized Chihuahua to the towering Great Dane, all belonging to a single biological species. Because the dog is a domesticated animal, the IUCN Red List does not assess it for extinction risk. This guide covers the dog as a species — its origins, biology, and the most-searched breeds — and is a companion to WARN's separate guide on street-dog welfare, rabies control, and humane spay-neuter (CNVR) programmes.

~900M

Dogs worldwide — the most numerous large carnivore on Earth

~63 days

Gestation period, remarkably consistent across all breeds

10–13 yrs

Typical lifespan, with small breeds often living longest

340+

Breeds recognised by major international registries

Figures sourced from American Veterinary Medical Association — pet care and dog health, Cornell University College of Veterinary Medicine — Canine Health Center, Fédération Cynologique Internationale (FCI) — recognised breeds and other references on this page.

Dog: Quick Facts

Vital statistics and key facts about the Dog
Scientific name	Canis lupus familiaris
Lifespan	~10–13 years (small breeds longer)
Weight range	~1.5 kg (Chihuahua) to 80+ kg (Mastiff)
Height range	~15 cm to 80+ cm at the shoulder
Diet	Omnivorous (carnivore-leaning)
Gestation	~63 days (58–68)
Litter size	1–3 (toy breeds) to 10+ (large breeds)
Baby name	Puppy
Group name	Pack (litter for puppies)
Recognised breeds	400+ worldwide; 340+ via the FCI

Scientific Classification

Scientific classification of the Dog
Kingdom	Animalia
Phylum	Chordata
Class	Mammalia
Order	Carnivora
Family	Canidae
Genus	Canis
Species	Canis lupus
Subspecies	Canis lupus familiaris

Conservation Status

IUCN Status: Not Evaluated (domesticated)
Population: ~900 million worldwide, of which a large share are free-roaming or street dogs
Trend: Stable to increasing globally
Assessed: Not applicable (domesticated species)
CITES: Not listed

As a domesticated animal, the dog is not assessed for extinction risk by the IUCN Red List and is not covered by CITES. Welfare and humane population management — not conservation status — are the relevant concerns.

Did you know?

A dog's sense of smell is so acute that the part of its brain devoted to analysing scent is, proportionally, about 40 times larger than ours — which is why dogs can be trained to detect everything from explosives to certain diseases.

Key Facts: Dog

Every dog breed — from the 1.5 kg teacup Chihuahua to the 80 kg Mastiff — belongs to one species, Canis lupus familiaris, descended from the grey wolf.
Dogs were the first domesticated animal, with genetic and fossil evidence pointing to domestication somewhere between roughly 15,000 and 40,000 years ago in Eurasia.
The average dog lives about 10–13 years; smaller breeds tend to outlive giant breeds, which often reach only 8–10 years.
Canine gestation lasts about 63 days (typically 58–68), and litter size varies from 1–3 puppies in toy breeds to 10 or more in large breeds.
Major registries such as the FCI recognise well over 300 breeds, though there are more than 400 breeds and landraces worldwide; all interbreed freely.
Of the world's ~900 million dogs, a large share are free-roaming or street dogs, especially across South Asia, Southeast Asia, and Latin America — the focus of WARN's welfare work.

History & Domestication

The dog is the oldest of all domesticated animals. Genetic studies show that dogs descend from an extinct population of grey wolves, and the split from the wolf lineage is estimated to have occurred somewhere between about 15,000 and 40,000 years ago, somewhere across Eurasia and possibly in more than one place. The leading hypothesis is that less-fearful wolves began scavenging around human camps and effectively domesticated themselves over generations, with tameness gradually favoured. Once that bond formed, people selectively bred dogs for jobs — hunting, herding, guarding, hauling, and companionship — which over millennia produced the extraordinary range of body shapes, coat types, and temperaments seen in modern breeds. Almost all of today's distinct breeds, however, are only a few centuries old, products of intensive 18th- and 19th-century breeding.

Biology & Behaviour

Dogs are highly social carnivores that have evolved alongside humans, giving them an unusual ability to read human gestures, faces, and tone of voice. Their sense of smell is their dominant sense — many times more sensitive than a human's — and they hear far higher frequencies than we do. Reproduction is consistent across the species: females come into season roughly twice a year, gestation lasts about 63 days, and puppies are born blind and deaf, opening their eyes at around two weeks. Diet is omnivorous-leaning-carnivore; unlike cats, dogs can digest starches well, an adaptation to living alongside farming humans. Body size drives much of the variation in health and longevity, with the smallest breeds typically living several years longer than the largest.

Choosing a Breed

Breed is best understood as a rough guide to size, coat, energy level, and temperament rather than a guarantee. High-energy working and herding breeds such as the Border Collie or German Shepherd need substantial daily exercise and mental work, while many companion breeds are content with less. Flat-faced (brachycephalic) breeds like the French Bulldog and Pug are popular but are prone to breathing, eye, and heat-tolerance problems, and tend to have shorter lifespans. Mixed-breed dogs often enjoy good general health and are widely available through rescue. Whatever the type, responsible ownership means matching a dog's needs to your lifestyle, and adopting rather than fuelling demand for poorly bred or trafficked puppies.

Welfare & Rescue

Across much of the world, most dogs are not pedigree pets but free-roaming community or street dogs. In the countries where WARN's partners work — its partner-network countries — large free-ranging dog populations face road injuries, disease, culling, and the risk of spreading rabies. The humane, evidence-based response is CNVR (catch, neuter, vaccinate, return) combined with mass rabies vaccination, which stabilises populations and protects both dogs and people far more effectively than culling. WARN's dedicated street-dog welfare guide covers these programmes in detail; this species guide is its companion, explaining the animal itself.

Dog vs. grey wolf at a glance

Trait	Domestic dog	Grey wolf
Scientific name	Canis lupus familiaris	Canis lupus
Relationship to humans	Domesticated companion	Wild, generally avoids people
Typical lifespan	~10–13 years	~6–8 years in the wild
Gestation	~63 days	~63 days
Diet	Omnivore-leaning, digests starch well	Carnivore, hunts large prey
Breeding	Up to twice a year	Once a year, seasonal

Dog Breeds Guide

From the Labrador Retriever and Golden Retriever to the French Bulldog, German Shepherd, and 45 more — browse 50 of the world's most searched dog breeds with temperament, health, and care guides.

Labrador Retriever

Canada (Newfoundland)

Friendly, outgoing, eager to please

Golden Retriever

Scotland

Gentle, devoted, playful

French Bulldog

France and England

Affectionate, easygoing, alert

German Shepherd

Germany

Loyal, confident, courageous

Poodle

Germany and France

Intelligent, elegant, eager

Beagle

England

Merry, curious, friendly

Dachshund

Germany

Spunky, clever, brave

Bulldog

England

Calm, courageous, friendly

Pembroke Welsh Corgi

Wales

Smart, bold, affectionate

Siberian Husky

Siberia (Russia)

Outgoing, energetic, mischievous

Rottweiler

Germany

Confident, loyal, protective

Boxer

Germany

Playful, energetic, loyal

Australian Shepherd

United States

Intelligent, energetic, loyal

Yorkshire Terrier

England

Bold, affectionate, lively

Cavalier King Charles Spaniel

England

Gentle, affectionate, friendly

Doberman Pinscher

Germany

Alert, loyal, intelligent

Miniature Schnauzer

Germany

Spirited, friendly, alert

Shih Tzu

Tibet/China

Affectionate, playful, charming

Boston Terrier

United States

Friendly, bright, amusing

Havanese

Cuba

Cheerful, social, intelligent

Shetland Sheepdog

Scotland (Shetland)

Intelligent, loyal, vocal

Bernese Mountain Dog

Switzerland

Gentle, calm, devoted

Great Dane

Germany

Gentle, friendly, dignified

Maltese

Malta

Gentle, playful, affectionate

Bichon Frise

Mediterranean

Cheerful, playful, social

Border Collie

Scotland/England border

Intelligent, energetic, focused

Chihuahua

Mexico

Alert, loyal, sassy

Cocker Spaniel

England/United States

Happy, gentle, merry

Mastiff

England

Calm, loyal, protective

Pomeranian

Germany/Poland

Bold, lively, inquisitive

Shiba Inu

Japan

Independent, alert, clean

Vizsla

Hungary

Affectionate, energetic, gentle

Weimaraner

Germany

Energetic, intelligent, loyal

Rhodesian Ridgeback

Southern Africa

Dignified, loyal, independent

West Highland White Terrier

Scotland

Confident, cheerful, hardy

Basset Hound

France

Easygoing, stubborn, friendly

Akita

Japan

Loyal, dignified, reserved

Alaskan Malamute

United States (Alaska)

Affectionate, strong, playful

Whippet

England

Gentle, quiet, athletic

Saint Bernard

Switzerland

Gentle, patient, watchful

Samoyed

Siberia

Friendly, social, mischievous

Staffordshire Bull Terrier

England

Bold, affectionate, reliable

Papillon

France/Belgium

Alert, friendly, intelligent

Bloodhound

Belgium/France

Gentle, stubborn, determined

Bull Terrier

England

Playful, stubborn, comical

Border Terrier

England/Scotland border

Plucky, affectionate, hardy

English Springer Spaniel

England

Friendly, eager, energetic

Miniature Poodle

Germany/France

Intelligent, active, proud

Standard Poodle

Germany/France

Intelligent, active, elegant

American Staffordshire Terrier

United States

Confident, loyal, courageous

What WARN Does

WARN channels donor funding to vetted local partners running companion-animal rescue and humane population management in its partner-network countries. That includes CNVR (catch, neuter, vaccinate, return) and mass anti-rabies vaccination for street dogs — most visibly through our Karachi street-dog programme — alongside emergency veterinary treatment, adoption support, and care for community cats. As an early-stage network we are honest that capacity is still building: every partner clinic we can fund means more dogs vaccinated, sterilised, and spared from culling.

For most of the world's 900 million dogs, the difference between suffering and a healthy life is a single vaccination and a sterilisation surgery. Your gift funds humane CNVR and rabies vaccination through WARN's partner clinics in Pakistan and beyond — protecting street dogs and the communities that live alongside them.

Support Street Dog Rescue Donate to WARN

How does the dog compare?

Cat vs Dog →Dog vs Wolf →Hyena vs Dog →

Dog: Frequently Asked Questions

How long do dogs live?

Most dogs live about 10–13 years on average. Smaller breeds often reach 14–16 years or more, while giant breeds such as Great Danes typically live only 8–10 years.

How many dog breeds are there?

There are more than 400 recognised dog breeds and landraces worldwide. The largest international body, the FCI, formally recognises over 340 breeds, while national registries list somewhat different numbers.

How long are dogs pregnant?

Canine gestation lasts about 63 days from conception, typically ranging from 58 to 68 days. Litters range from 1–3 puppies in toy breeds to 10 or more in large breeds.

What is a baby dog called?

A baby dog is called a puppy. Puppies are born blind and deaf, open their eyes at around two weeks, and are usually weaned by six to eight weeks.

What is a group of dogs called?

A group of dogs is most commonly called a pack. A group of puppies from the same birth is called a litter.

What do domestic dogs eat?

Domestic dogs eat Omnivorous (carnivore-leaning). A dog (Canis lupus familiaris) is a domesticated mammal descended from the grey wolf, kept worldwide as a companion, working, and assistance animal; it is the same species across every breed, from the Chihuahua to the Great Dane.

Where do domestic dogs live?

Domestic dogs live in ~1.5 kg (Chihuahua) to 80+ kg (Mastiff). A dog (Canis lupus familiaris) is a domesticated mammal descended from the grey wolf, kept worldwide as a companion, working, and assistance animal; it is the same species across every breed, from the Chihuahua to the Great Dane.

Are domestic dogs dangerous?

Domestic dogs are domesticated animals and are not dangerous to people in the wild-predator sense. A dog (Canis lupus familiaris) is a domesticated mammal descended from the grey wolf, kept worldwide as a companion, working, and assistance animal; it is the same species across every breed, from the Chihuahua to the Great Dane. Usual risks are husbandry and handling, not unprovoked attacks.

How big is a domestic dog?

A Domestic dog is about ~10–13 years (small breeds longer). A dog (Canis lupus familiaris) is a domesticated mammal descended from the grey wolf, kept worldwide as a companion, working, and assistance animal; it is the same species across every breed, from the Chihuahua to the Great Dane.

Sources & References

Population figures, conservation status and biological facts on this page are drawn from authoritative scientific and intergovernmental sources.

Terms used on this page

Plain-English definitions, from our wildlife and conservation glossary.

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