Scientific Name
Dogs are the domesticated descendants of the Wolf. There are many types of dogswhich we will list in detail below. Dogs have one of two scientific names depending on the species. The two scientific names for dogs are:
- Canis familiaris (domestic dog) — The most common and best fit for most types of pet dogs.
- Canis lupus familiaris (domestic wolf-dog) — A subspecies of the Wolf.
All types of dogs are in the family Canidaethe dog-like carnivorans or canidswhile the genus Canis means “dog” and includes wolvesdogscoyotesand jackals. Their subfamily is Caninaeor canineswhile their tribe is the dog-like or “true dog” tribe Canini and their sub-tribe is the wolf-like canids of Canina. Dogs are one of the first animals to be domesticated by prehistoric man.
History of Domestication
Humans and dogs have been in a long-standing partnership since ancient times. This partnership was likely formed out of the human need for help with herdinghuntingand alarm systemsas well as a source of food. In returndogs were provided with protectionshelterand companionship. The exact time that this relationship was forged is still being discussed.
Research conducted using mitochondrial DNA has revealed that wolves and dogs diverged into separate species about 100,000 years ago. While mtDNA research has provided some insight into the period of domestication that may have occurred between 40,000 and 20,000 years agoscientists have not reached an accord on the exact findings. Some theories state that the animals were first domesticated in East Asia. Others suggest it was in the Middle Eastwhile others propose that domestication took place in Europe at a later stage.
Experts now acknowledge that the range of different dog breeds we see today has only recently come about. Neverthelessthe remarkable variety of dogs is a reminder of their traditional and diverse domestication processes. Dog sizes range from tiny teacup poodleswhich weigh as little as one poundto enormous mastiffs tipping the scales at over 200 lbs. Furthermorethere are differences in the skullbodyand limb shapes of breedsand they also have varying abilitiessuch as searchingretrievingguidingand herding.
Humans were originally hunter-gatherersand as they moved aroundso did their dogs. This meant that the two populations were geographically isolated for a while. As the human population increased and trade networks developedpeople reconnectedand the dog population was genetically mixed. About 500 years agobreeders created different types of dogs from a fairly homogenous gene pool of dogs with mixed genetic heritages that had originated from various places.

Humans and dogs have been in a long-standing partnership since ancient timesformed out of the human need for help with herdinghuntingand protection.
©Anna Pozzi – Zoophotos/Shutterstock.com
Characteristics
There are many types of dogsbut all members of the genus Canis have common physical characteristics. Bone structurebehaviorand reproduction are just a few markers that are unique to canids. Many types of dogs have unique characteristics that distinguish them from wolves. You can use some of these markers to determine whether a canid is a wolf or a dog.
Canine teeth
Dogs are decedents of wolves and have a dental pattern that reflects their carnivorous diet. Their teeth are sharp and designed to rip apart and chew meat. The four sharppointed teeth many humans have are called ‘canines’ for their resemblance. Teeth are one of the easiest ways to identify a canine. Most canids (of the family Canidae) have 42 teethwith a dental formula of:
- 3.1.4.2
- 3.1.4.3.
Types of Dog Teeth And Their Function
| Tooth Type | Lower Teeth Count | Upper Teeth Count | Function |
| Molars | 6 | 4 | Shearing |
| Premolars | 8 | 8 | Shearing |
| Canines | 2 | 2 | Ripping |
| Incisors | 6 | 6 | Biting |
Learn everything you need to know about dog teeth here.

Modern dogs have a dental pattern that is the same as a wild wolf.
©iStock.com/alexandrshevchenko
Other canid features
Canids generally share similar skull featuresbasic body shapemonogamous and pack behaviorand retention of adult offspring.
Diet
Because dogs descended from wolvesthey are carnivores with biology designed for a meat-based diet. Howeververy few pet dogs today eat strictly meat. Modern dog food is much more affordable than a pure meat diet and offers a wider range of nutrients.
Today dog food is often made by blending meat with grains and vegetables. Different meats like salmonchickenvenisonbeefand pork are often used in dog food. These meats are commonly combined with potatoespeascarrotsand other vegetables.

Dogs in Halloween costumes can make us smilebut their dietary needs are no laughing matter.
©Inspired By Maps/Shutterstock.com
Depending on your pet’s dietary needsthere are many dog foods to choose from. There are dog foods to help your pet gain weight and dog food to help them lose weight. There are even dog foods for allergies. Many owners start by first choosing wet vs. dry dog food and going from there. Some of the best dog food options are below:
- Best Overall Dog Food
- Best Organic Dog Food
- Best Dog Food For Allergies
- Best Wet Dog Food
- Best Dry Dog Food
- Best High-Calorie Dog Food
- Best Freeze-Dried Dog Food
Some house plants are poisonous to dogsincluding BegoniaPoinsettiaand Aloe Vera. Many human food items are indigestible or toxic to dogssuch as chocolateoniongarlicmacadamia nutsxylitoland nicotine. Diet-wisedogs are omnivores and can handle a diet with more starch in it than a wolfwhich is more strictly carnivorous.

Dogs can eat meatgrainsfruitand vegetables.
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Features
Dogs have a greater variance in behavioral and physical variation than any other land mammalincluding wolves. Dogs have starch gel electrophoresis of red blood cell acid phosphatase. They also have smallercompressedand crumpled tympanic bullae. Physicallythey have a more domed forehead and “stop” between the nose and forehead.
Wolves have a more prominent temporalis muscle (the muscle that closes the jaws) and do not have dew claws on their back legs. Dogs lack a pre-caudal gland and go into estrus twice instead of once a year. Whereas dogs usually have brown eyeswolves have amber or pale-colored eyes. Their skin is thickerand their paws are half the size of those of a wolf.
Dog Exceptions
There are several tribes of the subfamily Caninae. The dog-like tribe Canini is sister to the wolf-like tribe Vulpini. They are in the suborder Caniformia or Canoideathe dog-like carnivorans. It stands in stark contrast to the cat-like carnivoransthe Feliformia or Feloidea suborder of Carnivora.

Dogs have brown eyes; wolves usually have amber-colored eyes.
©Iryna Inshyna/Shutterstock.com
Types of Dogs
Several types of dog groups are classified based on what they were bred to do:
Sporting dogs
Sporting dogs were bred to help their hunters capture and retrieve game birds. Retrievers swim and focus on waterfowlwhile settersspanielsand pointers hunt game birds. Their coats are often thick and water-repellant to protect against the elements. Some examples of sporting dog breeds are Golden RetrieverLabrador Retrieverthe Nova Scotia Duck Tolling RetrieverCocker Spanieland German Shorthaired Pointer.
Hound dogs
Hound dogs were bred to chase after warm-bloodedterrestrial prey. They are generally divided into sighthoundswho use speed and vision to chase jackrabbits and antelopeswhile scent hounds can use their noses to trail raccoons and people. All have strong prey drives. Some examples of hound dog breeds are BloodhoundGreyhoundand Dachshund.

Hound dogs can follow a scent that is over 48 hours old.
©iStock.com/artisteer
Working dogs
Working dogs were bred to perform tasks such as guarding families or pulling sleds and carts. The BoxerGreat Daneand Rottweiler and a few examples of working dog breeds.
Herding dogs
Herding dogs are a type of working dogalong with service dogs. While herding dogs help herd livestockservice dogs help people with disabilities. Howeverthey differ in that they were bred specifically to herd livestocksuch as sheepcattleand reindeer. Some are excellent for police and military work. A few examples of herding dog breeds are Border CollieGerman Shepherdand Icelandic Sheepdog.

Herding dogs must have a sharp attention span.
©iStock.com/Julia_Siomuha
Terrier dogs
Terrier dogs were bred to be small in order to go after vermin hiding in the ground. They include terrier breedswhich have long legs to dig out rodentsand “bully” breedswhich were used for bull-baiting and now make companion dogs. Bull TerrierScottish Terrierand Welsh Terrier are examples of terrier dog breeds. Some terrier breedslike the Airedale TerrierKerry Blue Terrierand the Irish Terrierhave curly fur.
Toy dogs
Toy dogs were bred for their small size to be companion dogs. They are perfect for city dwellers or anyone living in a small house. A few examples of toy dog breeds are ChihuahuaPugand Shih Tzu.
Non-sporting dogs
Non-sporting dogs do not fit into any of the other group types and were bred to be companion animals. The BulldogDalmatianand toy Poodle are a few examples of non-sporting dogs.
You can check out dogs that can protect you from dangerous animalslike mountain lionswhile hiking.

Toy poodles were bred for companionship.
©Rin Seiko/Shutterstock.com
Dog-wolf hybrids
Dogs share a common ancestor with modern wolves. Many large dog breeds have been bred with wolvessuch as malamutes and huskies. Some are sought by private citizenswhile others have been used for security work. For examplethe Russians in the late 1990s created a breeding program for wolf-dog hybrids called Volkosoby or Volkosobwhich are used for border control. See a list of 8 dogs that look like wolves here.
Dog Breeds by Letter Pages
- Dog Breeds that Start with A
- Dog Breeds that Start with B
- Dog Breeds that Start with C
- Dog Breeds that Start with D
- Dog Breeds that Start with E
- Dog Breeds that Start with F
- Dog Breeds that Start with G
- Dog Breeds that Start with H
- Dog Breeds that Start with I
- Dog Breeds that Start with J
- Dog Breeds that Start with K
- Dog Breeds that Start with L
- Dog Breeds that Start with M
- Dog Breeds that Start with N
- Dog Breeds that Start with O
- Dog Breeds that Start with P
- Dog Breeds that Start with Q
- Dog Breeds that Start with R
- Dog Breeds that Start with S
- Dog Breeds that Start with T
- Dog Breeds that Start with U
- Dog Breeds that Start with V
- Dog Breeds that Start with W
- Dog Breeds that Start with X
- Dog Breeds that Start with Y
- Dog Breeds that Start with Z