25 Facts About Puppies

iStock.com/sArhange1
iStock.com/sArhange1

Everyone loves puppies, we know. It's scientifically proven that they're heart-meltingly cute. But there's more to the little fur babies than just those adorable puppy eyes. In honor of National Puppy Day (which happens on March 23), here are 25 things everyone should know about these four-legged snuggle buddies.

1. The word puppy has French roots.

A dog with a red beret and a scarf.
iStock.com/Sergii Kozak

Etymologists think the term puppy may come from poupeé, a French word meaning doll or toy. The word puppy doesn't appear to have entered the English language until the late 16th century—before that, English speakers called baby dogs whelps. William Shakespeare's King John, believed to be written in the 1590s, is one of the earliest known works to use the (super cute) term puppy-dog.

2. Puppies evolved to be blind and deaf at birth.

A newborn baby puppy
iStock.com/ilona75

Puppies are functionally blind and deaf at birth. On day one, their eyes are firmly shut and their ear canals closed. Why? In brief, it’s part of an evolutionary trade-off. Since pregnancy can hurt a carnivore's ability to chase down food, dogs evolved to have short gestation periods. Brief pregnancies meant that canine mothers wouldn't need to take prolonged breaks from hunting. However, because dog embryos spend such a short time in the womb (only two months or so), puppies aren't born fully developed—and neither are their eyes or ears.

3. Puppies have baby teeth, too.

A puppy that still has its baby teeth
iStock.com/exies

Like many newborn mammals, puppies are born completely toothless. At 2 to 4 weeks of age, a puppy's 28 baby teeth will start to come in. Around 12 to 16 weeks old, those baby teeth fall out, and by the time pups are 6 months old, they should be sporting a set of 42 adult teeth.

4. Puppies take a lot of naps.

A puppy sleeps against a plush toy.
iStock.com/stonena7

Like children, puppies need a lot of sleep—up to 15 to 20 hours of it a day. The American Kennel Club strongly advises dog owners to resist the urge to disturb napping puppies, because sleep is critical for a young canine's developing brain, muscles, and immune system. Puppy owners should also establish a designated sleeping space on their pup's behalf so they can snooze undisturbed.

5. Certain breeds are usually born by C-section.

Three bulldog puppies
iStock.com/cynoclub

Purebred dogs can exhibit some extreme bodily proportions, which doesn't always make for easy births. Breeds with atypically large heads are more likely to be born by C-section than those with smaller skulls. A 2010 survey of 22,005 individual dog litters in the UK found that terriers, bulldogs, and French bulldogs had Caesarian births more than 80 percent of the time. The other breeds with the highest rates of C-sections were Scottish terriers, miniature bull terriers, Dandie Dinmont terriers, mastiffs, German wirehaired pointers, Clumber spaniels, and Pekingeses, according to the study.

6. Some breeds have bigger litters than others.

A Neopolitan Mastiff dog
iStock.com/Okikukai

As a general rule, smaller breeds tend to have smaller litters, while bigger dogs give birth to more puppies. The biggest litter on record was born to a Neapolitan mastiff that gave birth via Caesarian section to a batch of 24 puppies in Cambridgeshire, UK in 2004. In rare cases, very small dogs do give birth to relatively large litters, though. In 2011, a Chihuahua living in Carlisle, England gave birth to a whopping 10 puppies—twice as many as expected. Each weighed less than 2.5 ounces.

7. Some puppies are born green.

A golden retriever puppy wrapped in a green and white towel
iStock.com/yellowsarah

Sometimes, a puppy in a light-colored litter can be born green. On two different occasions in 2017, in fact, British dogs made the news for giving birth to green-tinted puppies. In January, a 2-year-old chocolate lab in Lancashire, UK gave birth to a litter that included a mossy-green pup. Her owners named her FiFi, after Fiona, the green-skinned ogre from Shrek. Just a few months later, a golden retriever in the Scottish Highlands also gave birth to a puppy with a green coat, a male named Forest. How did the puppies end up looking like Marvin the Martian? In rare cases, the fur of a light-haired puppy can get stained by biliverdin, a green pigment found in dog placentas. It's not permanent, though. The green hue gradually disappears over the course of a few weeks.

8. Puppies don't find your yawns contagious.

A puppy stands on a wooden walkway yawning.
iStock.com/Laures

Ever notice that when somebody yawns, other people may follow suit? Contagious yawning, thought to be a sign of empathy, affects humans, baboons, chimps, and yes, dogs. But as research published in Animal Cognition suggests, young canines aren't susceptible to catching yawns from birth. In the 2012 study, Swedish researchers took a group of 35 dogs between 4 and 14 months old on closely monitored play dates, feigning yawns in front of each individual animal. Dogs that were less than 7 months old didn't react, yet many of the older dogs would respond with a yawn of their own. This pattern mirrors what happens with humans—children don't pick up the habit of contagious yawning until around age 4, when they start to develop social skills like empathy. These results suggest that dogs, too, may develop empathy over the course of their puppyhood.

9. Puppies like "baby talk" more than their parents do.

A woman holds up a puppy.
iStock.com/jmalov

Like humans, puppies seem to grow out of baby talk, recent research has found. As part of a 2017 study, 30 women were asked to look at assorted photographs of people and dogs and utter this pre-written line: "Hi! Hello cutie! Who's a good boy? Come here! Good boy! Yes! Come here sweetie pie! What a good boy!" To the surprise of no one, the human test subjects spoke in a higher register while looking at dog pictures, especially puppy photos. Afterward, the researchers played the recordings for 10 adult pooches and 10 puppies. Almost all of the pups started barking and running toward the speaker when they heard the baby-talk recordings. In contrast, the grown dogs pretty much ignored the recordings altogether.

10. Dalmatian puppies are born without spots.

A mother Dalmatian and her puppy snuggle together.
iStock.com/SolStock

Beloved by firefighters, Disney fans, and George Washington, Dalmatians arguably have the most recognizable coat of any dog breed. Or at least, full-grown Dalmatians do. As puppies, they're born white and spot-less. The markings usually begin to show up after four weeks or so. (A small subset of Dalmatian puppies are born with one or two large black blotches, known as patches, but those markings aren't allowed in most competitive show rings.)

11. Puppies know how to manipulate you with their eyes.

Cute pug with sad eyes
iStock.com/feedough

Those adorable "puppy eyes" aren't an inadvertent expression of canine emotion; they're a deliberate ploy to get our attention. Puppies (and adult dogs) have learned that raising their eyebrows, which makes their eyes appear bigger and sadder, makes them magnets for human attention. According to one study from 2017, dogs are more likely to make dramatic facial expressions like puppy-dog eyes when they know humans are watching. And it works. Research has shown that shelter puppies who put on such faces get adopted more quickly than dogs that show other behaviors, like wagging their tails.

12. Puppies can have identical twins.

Two identical puppies and their mother sit in the grass.

Scientists don't know how common identical twin puppies are, because until very recently, no one was able to prove that they existed at all. In 2016, Kurt de Cramer, a South African veterinarian, noticed something unusual while performing a C-section on a pregnant Irish wolfhound. Normally, every puppy gets its own placenta, yet de Cramer noticed that two of the seven pups in this litter shared a single placenta. Testing later verified that the puppies were genetically identical. It was the first confirmed case of identical twin puppies in the world.

13. Scientists have successfully cloned (and re-cloned) them.

Three puppies sit on a cushion.
Kim et al., Scientific Reports (2017)

In 1996, Dolly the sheep became the first successful mammal clone. Nine years later, geneticists in South Korea used the same process to engineer the world's first canine clone, an Afghan hound named Snuppy. While Snuppy passed away in 2015 at the respectable age of 10, his story isn't over yet. In 2017, researchers announced that four puppies had been cloned from his stem cells. Sadly, one of the pups died a few days after its birth, but the other three survived. Scientists hope that these young dogs will teach us how healthy cloned animals are compared to their naturally conceived counterparts.

14. Lin-Manuel Miranda's puppy inspired a song in Hamilton.

Lin-Manuel Miranda
Justin Sullivan, Getty Images

In the award-winning musical Hamilton, Aaron Burr and Alexander Hamilton sing a ballad called "Dear Theodosia" to their newborn children. The tender song's inspiration wasn't a newborn babe, though. Lin-Manuel Miranda wrote it the week he adopted Tobillo, a stray puppy he and his wife found while on vacation in 2011.

15. A puppy destroyed half of John Steinbeck's Of Mice and Men manuscript.

A black-and-white portrait of John Steinbeck
Hulton Archive/Getty Images

Of Mice and Men might feature one of the biggest animal lovers in American literature—the rabbit- and puppy-loving Lennie—but ironically, a puppy once jeopardized the novel's existence. In May 1936, John Steinbeck's Irish setter, Toby, was going through his teething phase. Left alone one night, he demolished half of his master's manuscript for Of Mice and Men, eating through two months of work ... and Steinbeck didn't have any backup copies. But the author found it hard to stay angry with the puppy. "I was pretty mad, but the poor little fellow may have been acting critically," Steinbeck wrote. "I didn't want to ruin a good dog for a manuscript I'm not sure is good at all." He just buckled down and rewrote the shredded chapters.

16. Keith Richards once smuggled a puppy through British customs.

English guitarist Keith Richards of the Rolling Stones, circa 1965
Keystone Features/Hulton Archive/Getty Images

While the Rolling Stones were on tour in the U.S. in 1964, a fan gave guitarist Keith Richards a collie puppy named Ratbag. When Richards returned to the UK, rather than subject the pup to quarantine, he smuggled the animal through British customs under his coat. The dog would become one of Richards's most beloved companions, and a biographer would later write that the star "appeared to identify [with Ratbag] more than anybody else."

17. Barack Obama's puppy has his own baseball card.

Bo Obama sits on the White House lawn.
Obama White House, Flickr // Public Domain

In April 2009, the Obamas adopted Bo, a 6-month-old Portuguese water dog. That summer, the White House put together an official baseball card loaded with fun facts about America's First Pooch. (For one: He can't swim.) You can still download the collectible card online.

18. The Soviet Union once gave JFK a very special puppy.

President Kennedy, John F. Kennedy Jr., Mrs. Kennedy, Caroline Kennedy. Dogs: Clipper ( standing ), Charlie ( with Caroline ), Wolf ( reclining ), Shannon ( with John Jr. ), two of Pushinka's puppies ( with Mrs. Kennedy ).
Cecil Stoughton White House Photographs, Public Domain, Wikimedia Commons

Dogs can bring out the best in people, including political adversaries. While seated next to each other at a state dinner in Vienna in the early 1960s, First Lady Jackie Kennedy and Soviet Premier Nikita Khrushchev got to chatting about Strelka, the world-famous dog who had recently been sent into low-Earth orbit by the Soviet space program. Afterward, Khrushchev sent the Kennedys one of Strelka's newly born daughters. The puppy's name was Pushinka, which means fluffy in Russian.

19. A Boston museum has enlisted a puppy to find art-destroying pests.

Museum of Fine Arts, Boston
iStock.com/dosecreative

In early 2018, Boston's Museum of Fine Arts "hired" a Weimaraner pup named Riley to find unwanted pests that, if left unchecked, could harm priceless masterpieces. Riley is being taught to sniff out art-threatening insects like textile-eating moths and wood-boring beetles. "Pests are an ongoing concern for museums," deputy director Katie Getchell told The Boston Globe in January 2018. "It's exciting to think about this as a new way to address the problem." If Riley is able to do his job well, she said, other museums and archives that collect infestation-prone materials might be able to use trained dogs as a defense against bugs, too.

20. IBM's Watson is judging puppies now.

Guide dog puppies in training are led by their trainers.
Erik S. Lesser, Getty Images

Not all puppies have what it takes to become guide dogs. Guide dogs have to be healthy, confident, hardworking, and not easily distracted. At the end of the day, many pups just aren't cut out for this line of work—at Guiding Eyes for the Blind, a nonprofit that trains and places seeing eye dogs in New York, only about 36 percent of trainee dogs make it. That's where Watson, the IBM supercomputer famous for winning Jeopardy, comes in. IBM has developed a program for Watson that helps it predict how likely individual puppies are to graduate from Guiding Eyes's training school using data on the temperament, medical history, and genetics of the dogs as well as the personality traits of their trainers. 

21. Looking at puppies can make you more productive.

A poodle puppy sits on a desk next to a man working on a laptop.
iStock.com/ThamKC

That puppy portrait hanging in your cubicle at work might be a bigger asset than you realized. For a 2012 Hiroshima University experiment on productivity, participants were asked to look at pictures from one of three categories: tasty food snapshots, pictures of adult animals, or photos of puppies and kittens. Then, they were asked to play a board game that required lots of precision. As it turned out, people who'd just seen puppies and kittens had an easier time concentrating on the task at hand than study subjects who saw other types of images.

22. Our stone-age ancestors took good care of their puppies.

A canine jawbone
Janssens et al., Journal of Archaeological Science (2018)

In 1914, archaeologists in Germany discovered the fossilized jawbone of a puppy that lived 14,000 years ago. According to a 2018 study on the specimen, the jaw probably belonged to a 27- or 28-week-old pup—and a sick one, at that. The teeth showed signs of canine distemper virus, a life-threatening disease that still has no cure. Analysis of the bone suggested that the animal first came down with the sickness at 19 weeks old. "Without adequate care," study co-author Luc Janssens noted in a press release, "a dog with a serious case of distemper will die in less than three weeks," yet this pup survived for another eight weeks. Even though the puppy wouldn't have been very useful to its prehistoric human owners, they kept it clean, warm, and well-fed for months, helping it survive for longer than it otherwise would have.

23. There's a 17-ton puppy sculpture in Bilbao, Spain.

Puppy kissing the Iberdrola skyscraper at the Guggenheim Museum Bilbao
iStock.com/luisrsphoto

Since it opened in 1997, the Guggenheim Museum in Bilbao has been home to Puppy, a towering, flower-covered sculpture that artist Jeff Koons modeled after a young West Highland terrier. The 17-ton pooch owes its shape to a fabric-covered mesh that is topped with 37,000 live flowers. The 40-foot-tall, puppy-shaped garden is now regarded as a mascot for both the museum and the city itself.

24. They're not running around the Puppy Bowl live. (Sorry.)

A puppy plays with a toy at the Puppy Bowl.
Animal Planet

The fur-rocious Super Bowl spoof known as the Puppy Bowl made its debut on Animal Planet back in 2005. Viewers might be surprised to find out that, unlike the real game, the Puppy Bowl isn't broadcast live. Instead, the contest is shot over the course of an entire week. The crew spends two days filming the dogs with the help of 100 or more canine wranglers. 

25. Hollywood's most iconic dog was a troublesome puppy.

Lassie
Hulton Archive/Getty Images

The first dog to play Lassie on film was really a "laddie." Specifically, he was a male Rough collie named Pal. As a pup, the dog had some behavior issues—little Pal was overly enthusiastic and drove his first owner crazy with nonstop barking. (Even more disconcerting was the puppy's habit of chasing down motorcycles, a pastime he never outgrew.) After animal trainer Henry Peck failed to make any progress with Pal, he referred the puppy's owner to a colleague by the name of Rudd Weatherwax, who was much more successful at training him. Pal's original owner eventually gave him to Weatherwax, and the rest is history. Under the trainer's guidance, Pal starred in seven Lassie movies, plus two episodes of the spinoff TV series. Decades after his passing, The Saturday Evening Post declared that Pal had enjoyed "the most spectacular canine career in film history."

This story first ran in 2018.

5 Ways You Can Help the Jaguar Rescue Center Save Costa Rica’s Wildlife

A curious sloth says hello after members of the Jaguar Rescue Center reunited her with her baby.
A curious sloth says hello after members of the Jaguar Rescue Center reunited her with her baby.
Jaguar Rescue Center

In 2005, Catalonian primatologist Encar Garcia and her husband, Italian herpetologist Sandro Alviani, were living in southwestern Costa Rica when locals began to bring them injured animals in hopes that the two experts could save them. As word spread and more animals arrived, their property slowly transformed into a full-fledged rescue center. So they purchased the surrounding land and named their new organization the Jaguar Rescue Center (JRC), after one of their early rescues: a young, orphaned jaguar whose mother had been killed by farmers.

Today, the center covers nearly 5.5 acres of land near Puerto Viejo de Talamanca in Costa Rica’s Limón province. It can accommodate around 160 animals at a time, and is home to everything from spider monkeys to sea turtles (though, by law, staff members aren’t allowed to accept domesticated animals like cats and dogs).

While locals still bring injured and orphaned animals to the JRC, others are brought by tourists, the Ministry of Environment and Energy, the National Animal Health Service, and even the police, who confiscate animals that have been poached or illegally kept as pets.

howler monkey at jaguar rescue center
Skye, a young howler monkey who recovered from electrocution.
Jaguar Rescue Center

The rescues are often victims of road accidents, animal attacks, environmental destruction, human interaction, or electrocution from exposed power lines. After the animals are rehabilitated, they’re released into La Ceiba Natural Reserve, a human-free (except for JRC workers) part of the forest where they can safely reacclimate to living in the wild. The JRC has cameras installed in the area to monitor the animals after their release and make sure they’re finding enough food.

Unfortunately, not all the creatures brought to the JRC recover from their injuries—in 2019, for example, 311 of the 749 rescues died [PDF]—so JRC staff members and volunteers understand just how remarkable it is to watch an animal regain its health and be successfully returned to its natural environment.

“There are so many amazing things about working for the JRC, but I think we all can agree that seeing a rescued animal make it through rehabilitation and be released is the best and most rewarding part of the job,” Torey, a JRC tour guide, tells Mental Floss.

Some thought-to-be-orphaned sloths are even released right back into the arms of their mothers. After recording the cries of a baby sloth, JRC staff will take the sloth back to wherever it was first found, play the recording, and wait for the mother to recognize the cries and (slowly) climb down from her leafy abode to reunite with her child.

Despite its partnerships with government agencies, the JRC doesn’t receive government funding. Instead, it relies on public donations and revenue from its visitor services. Find out more about how you can help below.

1. Donate money.

You can make a one-time or monthly donation that will go toward food, medical care, and supplies for the animals, or you can donate specifically to the JRC’s “Shock Free Zone” program, which insulates power lines and transformers that run through forests to prevent them from electrocuting wildlife.

2. Donate items.

Check out the JRC’s Amazon wish list to see which items are most needed—and what they’ll be used for, too. Examples include Pampers diapers for baby monkeys, snake hooks for safely rescuing snakes, and cans of worms to feed birds, opossums, and bats.

One of the most important products on the list is powdered goat’s milk, which staff members use to feed orphans of many mammalian species at the JRC.

“It has the most universally digestible enzyme compared to other milk,” Torey says. “Unfortunately, we do not have sloth milk, monkey milk, etc. readily available for the baby animals.”

3. “Adopt” an animal.

diavolino, a margay at the jaguar rescue center
Diavolino, the Jaguar Rescue Center's "feisty little margay."
Jaguar Rescue Center

For $105, you can virtually “adopt” an animal at the JRC. Choices range from Diavolino, a “feisty little margay” rescued from the illegal pet trade, to Floqui, a whitish two-fingered sloth who was born with only one digit on each hand and foot.

4. Visit the Jaguar Rescue Center.

You can stay overnight at the JRC in one of its three visitor residences—La Ceiba House, Ilán Ilán House, or one of the Jaguar Inn bungalows—which offer a variety of amenities, restaurant service, and access to nearby beaches.

Whether or not you’re staying there, you can book a tour of the JRC, where you’ll get to explore the premises and even meet some of the animals. There are private, public, nighttime, and VIP tours, and you can find out more here.

5. Volunteer at the Jaguar Rescue Center.

If you’re looking for a more hands-on, potentially life-changing way to help Costa Rica’s wildlife, you can apply for the JRC’s four-week volunteer program or a position at La Ceiba Natural Reserve that lasts three to six months.

According to the website, JRC volunteers are housed in the Jaguar Inn and help with “a broad range of tasks, from doing the dishes and cleaning up after the animals ... to building and remodeling enclosures, or babysitting a new arrival to ease the stress of their new environment.”

La Ceiba volunteers, on the other hand, stay right on the reserve and do everything from monitoring captive and recently released animals to keeping the trails clear.

Find out more about becoming a volunteer here.

YouTube Star Coyote Peterson Brings 'Misunderstood' Animals to His New Animal Planet Series

Animal Planet
Animal Planet

As host of the popular YouTube series Brave Wilderness, Coyote Peterson is no stranger to going face-to-face with creatures many deem terrifying—think great white sharks and pit vipers—but that he says are simply "misunderstood."

Animals have always been a big part of Peterson's life, even before he made a career out of being stung and bitten by ferocious critters. The Ohio native studied video production and directing at Ohio State University, and then decided to combine his two passions—film and all things wild—to teach viewers about wildlife and the importance of conservation. His YouTube channel currently has more than 15 million subscribers.

Now Peterson is embarking on a new adventure with Animal Planet in the show Brave the Wild. He'll travel all over the world with wildlife biologist Mario Aldecoa and his crew, sharing creatures that aren't often in the spotlight and that viewers may find a little frightening. He recently chatted with Mental Floss about the importance of conservation, his thing for snapping turtles, and his close encounter with a jaguar and her three cubs.

You’ve said your love of animals started with snapping turtles. Can you talk about the first time you saw one and what about them fascinated you so much?

The first snapping turtle I caught was when I was only 8 years old. I was always fascinated with turtles, because at first glance they look prehistoric, almost dinosaur-like. Growing up in Ohio, I never got to see any "exotic" animals. My favorite thing to watch on TV was Steve Irwin. Watching him wrestle crocs is what inspired me to catch my first snapping turtle, the most dangerous animal Ohio has to offer.

Coyote Peterson with a gigantic snapping turtle
Animal Planet

In Brave the Wild, you introduce animals that are often feared or misunderstood. What's the importance in exposing viewers to these creatures?

One of my goals through this series was to inspire people to overcome their fears of these seemingly dangerous animals and learn to admire them from a safe distance. The more you understand these creatures, the less you are afraid of them. One of the messages I try to convey in every episode is the importance of conservation.

What’s the most "misunderstood" creature you've encountered?

The most misunderstood creature that comes to mind is the carpet shark, which we filmed in season one. As I always say, people’s biggest fears are the three S’s (sharks, snakes and spiders). The carpet shark is found off the coast of Australia. They only bite humans in the case of mistaken identity. To some of these sharks a person’s foot might look like a fish. Any time you enter a new environment you need to be aware of what you need to look for, not only to keep yourself safe, but the animal as well.

What goes into preparing for each encounter to make sure you and the animals come out alive?

With any new expedition, you need to come into the environment knowing exactly what to expect. When encountering a new animal, I try to stay as calm as I can and have no hesitation. If I stay calm, the animal stays calm, [and] I'm creating a safer interaction for myself. I use different tactics when I encounter different animals. It also depends on whether the environment is land or in water.

How do you keep your composure on camera when you're in a potentially dangerous situation?

Any situation I find myself in, I look at it as my job. For example, I would be afraid operating a crane, because that is something I don't do. If it's part of your job, it's something that you get used to. When I do my job, I make sure I'm focused and never hesitate. Before I encounter any animal, I know what I'm going to say to the camera. I say that, for the best show, we always need to have the camera rolling so the audience can see what is happening.

Coyote Peterson with a kangaroo
Animal Planet

You were in Australia filming Brave the Wild during bushfire season. What was that like?

Visiting Australia was one of the best experiences I had filming the show. Australia is a fascinating country that has so many unique environments. We spent over 50 days in Australia and encountered more than 35 different species. We were there right before all these devastating fires started, and we got to witness the severity of the drought and all the different animals it impacted.

What was your favorite animal encounter in upcoming series?

Each encounter I have in the wild is special. I would have to say that the most exciting moment for me was when we were filming in Brazil and I saw a jaguar and three of her cubs up close. Not only did I get to see this in real life, but my amazing team was able to capture this special moment on tape. It is just so amazing seeing these animals survive and thrive in the wild while dealing with not only the dangers of the wild but human encroachment as well. Hands down, this was my favorite episode that we got to film.

Catch new episodes of Brave the Wild on Animal Planet, Sundays at 9 p.m. ET/PT.

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