Two border terriers train for the earthdog trials, while two puppies learn quarrying.
The French bulldog looks like a bruiser, but it's more of a class clown than a bully.
The Brittany spaniel is a small yet versatile bird dog.
Bred by Siberian nomads, the Samoyed developed as all-purpose working dogs with a hankering for wandering.
Scottish terriers have been immortalized in high art and pop culture more than any other breed of dog.
A breed once employed to guard Buddhist monasteries in Tibet is a great show dog known for its beautiful coat.
Known for farm work and its service with French and Belgian troops, the Bouvier is a vigilant watchdog.
Once known as the "poor man's racing dog," today's whippets run for fun in a sport known as lure coursing.
Smooth fox-terriers originally are bred to flush foxes from dens.
Chows: litter; raising; local dog shows.
Loyal and attentive, Australian shepherds are smart working dogs with strong herding and guarding instincts.
Hunters by nature, Yorkshire terriers helped catch the rats that plagued England in the 1800s.
Due to their strong olfactory sense, Chesapeake Bay retrievers are excellent duck-hunters.
The British bred the bull mastiff to protect estates against poachers.
The Irish Wolfhound Club president recites the history and legends of the breed.
The English springer spaniel, a bouncy and animated breed, was originally developed to flush game from hiding.
West highland white terriers were bred to rid communities of unpleasant rodents.
Pomeranians, one of the world's most popular toy breeds, descended from European sled dogs and herding breeds.
Coonhounds are originally used to control the raccoon population.
A sheepdog bred in the Shetland Islands has become a popular pet with a trademark bark.
Bernese mountain dogs use cart-pulling skills to compete in draft-dog competitions.
A specialist trains Great Pyrenees to protect ranches from coyotes and other dangers.
Retrievers: training difficulties; police dogs; cancer percentages; intelligence quotient.
The dignified and courageous Akita breed was officially designated as a national treasure in its homeland of Japan in 1931.
Papillons are thought of as comforting, little lap dogs, however, tests show it's one of the smartest breeds, ranking high in trainability.
Profiling St. Bernards, a huge breed known for mountain rescues.
Profiling Shar-Peis, a Chinese breed known for their protection skills, which came close to extinction.
Looking into the mild-mannered and kind heart belied by the English bulldog's tough exterior.
A terrier bred to chase otters along the United Kingdom's Aire River became valued by the military during World Wars I and II.
Royalty bred dogs from China with toy spaniels to create the Japanese chin.
Robust sheepdogs bred for herding are also used for their detection skills.
The amazing sense of scent possessed by the bloodhound.
Bred to wrangle livestock in Australia in the 1800s, the cattle dog can be found working and competing across the United States today.
Husky owners attend a California mushing clinic; a couple share their passion for snow sledding with a dog team.
Tall and slender like a greyhound with long, hanging ears, the Saluki's origins can be traced back to ancient Egypt.
Breeds of schnauzers include miniatures, standards and giants.
The Rhodesian Ridgeback is a strong, short-haired breed of hunting dog originally developed in South Africa.
Golden retrievers are trained to help people with disabilities.
Studying the unique characteristics of the borzoi, one of the purest breeds of the ancient Russian wolfhound.
Studying various roles performed by the dachshund, which was originally bred to tunnel to chase beavers.
Originally bred as a hunter, the basset hound is now described as the only dog that needs to be coaxed to go for a walk.
History of the Weimaraner, a medium-sized hunting dog noted for its tracking ability; William Wegman photographs his Weimaraner models.
Poodles have exceptional intelligence and a great sense of humor despite their aloof appearance.
Dobermans are well-known for their work as police dogs, but they have a softer side as therapy and service dogs, and even as dance partners.
Portuguese water dogs were originally bred to assist fisherman.
Profiling pugs, one of the most documented breeds in history dating to Renaissance paintings.
Profiling the Newfoundland, a dog breed with webbed feet and a large lung capacity.
Brought to England by ancient traders, the mastiff is an antique breed.
Tracing the history and development of the Irish setter, known as a bird dog of the highest order.
The English fox hound, noted for its hunting instincts, is one of the few breeds displayed in its natural form rather than as a show dog.
Known as the "ultimate lap dog," the Cavalier King Charles was named for a British monarch whose ghost reportedly haunts a historic home in London.
Profiling collies, a loyal and affectionate dog with a particular affinity for small children.
Rottweilers have an unwarranted reputation.
Dating to ancient Egypt, the basenji is a small dog prized for its intelligence, speed, hunting ability and silence.
Bred for battling in dog fights, the bull terrier has a positive attitude despite its tough dog history.
The Cardigan Welsh Corgi, a renowned herding dog and household pet, is one of the oldest breeds known to man.
The smallest breed; Gidget, the Taco Bell chihuahua.
One of the few breeds native to the United States, the Boston terrier is considered to be the ultimate house pet.
The Jack Russell terrier is buoyant and intelligent, determined and relentless.
Boxer history, a profile of a champion and the controversy over ear cropping.
Border collies show off their ability to herd livestock in Tennessee and Virginia.
Dalmatians; speed/endurance test; obstacle course; animal trainers.
Swiss mountain dogs, known for herding cattle, are endangered.
Old English sheep dogs are determined workers and devoted pets.
Beagles display their hunting abilities at the National Beagle Show in Aldie, Va.
Afghan hounds have strong hunting skills.
The aptly named pointers and their ability to point, flush and retrieve prey.
The terrier has come to represent tenacity and feistiness.
The greyhound, the oldest purebred canine, has a history that can be traced to ancient Egypt, Greece and Rome.
Labrador retrievers are renowned for their ability to hunt and guide.
German shepherds, originally bred to herd, have become versatile working as service canines and in law enforcement.
Meeting statuesque and sweet Great Danes, including one owned by former Olympian Greg Louganis.