Written By: Kostya Kennedy

America is home to about 90 million dogs, a sometimes quiet, invariably curious, and often rollicking mass of canines who have the essentials of life never far from mind: Love, food, fun, sleep. If there’s one thing about dogs, they know how to live. It’s not quite true that dogs rule the planet—though, as Jerry Seinfeld says, an observer might think so after watching humans bending to scoop up dog droppings. But it sometimes seem that a pup’s outlook on existence, in its simplicity of wants and its simplicity of virtues (loyalty and empathy chief among them) represents a life-form that has things figured out.

There are exceptions. Dogs can be like humans. Some dogs are nuts. Some are skittish, or inappropriately exuberant, or lazy. They can be given to possessiveness and envy. The German expression Salat Hund, which means salad dog, refers to the dog who, despite his ancient-bred carnivorousness, would eat even a bowl of lettuce and tomatoes should he think that the dog beside him wants to eat it too.

They sit when you say “Sit!” and come when you call “Come!” and raise their front paw to shake your hand, just because they know you like it. These are animals who can drive a herd or guard a home or nose out a felon in hiding. And yet the things they will do for our amusement! Skateboarding, skydiving, dancing on their hind legs. They can balance things on their snouts and wear women’s clothes. Where would America’s Funniest Home Videos be without them? Dogs do what they are told and they also do what they want. Hence the after-bath shake, the rolling in unspeakable mud, the Halloween candy that suddenly disappears.

We blanket a clan that encompasses hundreds of breeds, from affenpinscher to Yorkshire terrier. The world’s largest dog (Great Dane) is 40 times the size of the smallest (Chihuahua). The breeds have their traits and we celebrate them as only humans can, chronicling the instincts of Buck, the sled dog, in Call of the Wild; and the courage of Old Yeller, a black mouth cur; and the fellowship of the Jack Russell terrier in My Dog Skip. In terms of integrity it’s not the breed that matters. It’s the doghood. Benji is a mutt.

As a rule, dogs and books go well together. John Grogan’s dog memoir Marley & Me has sold more than 6 million copies. W. Bruce Cameron’s A Dog’s Purpose spent 52 weeks on the best-seller list. In fact, for people given to the pleasures of books and reading—and if you are here, you are among them—a book may be the dog’s strongest rival as a companion for humankind. As Groucho put it: “Outside of a book, a dog is a man’s best friend. Inside of a dog it’s too dark to read.”

—by Kostya Kennedy, in Dogs: Why We Need Them. Why They Need Us.

Below are selected images from LIFE’s special issue on dogs.

Photo by GlobalP/iStock/Getty Images

Lassie was invited to the party along with other movie stars when MGM celebrated its 25th anniversary.

Photo by Bob Landry/The LIFE Images Collection/Getty Images

In Chicago in 1954, owners lined up with their dogs in order to receive vaccines that had been ordered by the state in response to a rabies outbreak. Some 45,000 received shots.

Photo by Bettmann Archive/Getty Images

Twenty, the dalmatian mascot of New York City’s Ladder 20 fire station was a gift from two Rochester, N.Y. sheriffs after the World Trade Center attacks in 2001.

Photo by Mario Tama/Getty Images

Timm Jackson, 10 years old from Texas, a patient at NIH, snuggled with ‘Scooter’ as part of therapy by a group of visiting dogs from the Delta Society National Capitol Therapy Dogs.

Photo by Carol Guzy/The Washington Post/Getty Images

President Barack Obama welcomed the family’s new dog, Bo, a six-month old Portuguese water dog, to the White House in 2009.

Photo by Pete Souza/The White House via Getty Images

Gunnery sergeant Christopher Willingham, of Tuscaloosa, Ala., posed with retired US Marine dog Lucca in 2016. The 12-year-old German Shepherd lost her leg, in Helmand Province, Afghanistan, when Lucca discovered a 30-pound improvised explosive device, and as she searched for additional IEDs, a second device detonated. Over six years Lucca completed over 400 separate missions in Iraq and Afghanistan.

Photo by Frank Augstein/AP/REX/Shutterstock

In Malta, Titti and Carmelo performed their dives for appreciative crowds.

Photo by Mark Cassar /Barcroft Media/Barcroft Media via Getty Images)

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