Dogs have been our furry companions for thousands of years, but they didn't always look the way they do today.
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Here's what popular dog breeds looked like before and after 100 years of breeding
Dogs looked pretty different a century ago.
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Many well-known breeds have changed a lot physically in the last century, thanks to humans.
By identifying specific traits — such as size, coat color, and demeanor — and allowing only those animals to mate, we've created at least 167 different "breeds," or groups of dogs with unique physical and mental characteristics. Still, they're all part of the same species.
The Science of Dogs blog put together a side-by-side comparison of several popular breeds from the 1915 book "Dogs of All Nations" by Walter Esplin Mason, showing what they look like today.
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Here are some of the dogs from that list, plus a couple more we found ourselves.
Tanya Lewis contributed to an earlier version of this post.
Bull terrier then
The bull terrier was first recognized as a breed by the American Kennel Club (AKC) in 1885. In 1915, it appears to have been a fit, good-looking dog, with a well-proportioned head and slim torso. "Dogs of All Nations" called it "the embodiment of agility, grace, elegance and determination," and the "gladiator of the canine race."
Bull terrier now
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But today, bull terriers are bred to have a football-shaped head and a thick, squat body — a far cry from the lean and handsome dog of 1915.
The AKC now states that the dog's faceAccording to Science of Dogs, it also developed extra teeth and a habit of chasing its tail.
English bulldog then
Few dogs have been as artificially shaped by breeding as the English bulldog. In the UK, the dogs were used for bull-baiting — a blood sport where dogs were used to bait and attack bulls — until it became illegal in 1835. In 1915, the bulldog already had some of the characteristic features we see today, like saggy jowls and a squat stance.
English bulldog now
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Today, breeders have bred the bulldog to have more pronounced facial wrinkles, and an even thicker and squatter body. The AKC describes the ideal dog as having a " Sadly, bulldogs suffer from a number of health issues, such as breathing problems and overheating.
German shepherd then
German shepherds have come to symbolize everything from loyalty and companionship to police brutality. The AKC first recognized is as a breed in 1908. In 1915, "Dogs of All Nations" described it as a "medium sized dog" weighing just 55 pounds, with a "deep chest, straight back and strong loins."
German shepherd now
But today's German shepherds are bred to be considerably larger — 75 to 95 pounds — with a more sloping back. The AKC describes the ideal specimen as "
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But they are also prone to health problems, such as hip dysplasia, where the leg bones don't fit properly into the hip socket, and bloat, a condition in which the stomach can expand with air and twist, which can sometimes be fatal.
Airedale terrier then
Though you can't tell from this photo, "Dogs of All Nations" described the coloring of the Airedale's head and ears as a rich tan, as well as the legs up to the thighs and elbows. And the dog's coat was "hard and wiry," but not long enough to be "ragged."
Airedale terrier now
Today, the color appears not to have changed much, but the fur of modern Airedales definitely looks longer and more "ragged" than it was in 1915 — though why breeders value that now, we can't say. Airedales are considered the largest of all terriers, and are sporting and playful.
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Shetland sheepdog then
The Shetland sheepdog, or Sheltie, wasn't recognized by the American Kennel Club until 1911, just four years before the book this image is from was published. At that time, the book reported that it weighed just 7 to 10 pounds and appeared to have medium-length fur.
Shetland sheepdog now
Today, the dogs have been bred to be larger, weighing at least 20 pounds, though still slight. And their fur has become unmistakably longer than in 1915. The AKC now describes them as " They are also very intelligent, and good at herding.
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