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Tag: wolves

Native American dogs were all but wiped out by settlers from Europe, study says


Ancient dogs arrived in the Americas alongside humans more than 10,000 years and — like those humans — were commonly exterminated by more newly arriving colonists from Europe, a new study suggests.

“European colonists viewed native dogs as kind of pests, and they freely killed them,” said Angela Perri, a research fellow at Durham University in England.

Colonists who killed entire villages of people would also kill their dogs. And when some early Spanish explorers would find themselves without enough food, they’d turn to native American dogs, she added.

In the study, researchers looked at genes from more than 71 archaeological dog remains in North America and Siberia and compared them with modern dog genes.

Perri, the study’s lead author, said it dispels the theory that dogs in the Americas evolved from wolves. The study was published July 5 in the journal Science.

The findings “put a nail in the coffin really for [that] idea,” she told Live Science. In the new data, “we just had absolutely no evidence of that.”

Instead, after analyzing samples from dog remains going back thousands of years from North America and Siberia, they suspect the first dogs came to the Americas more than 10,000 years ago, across the Bering land bridge that connected North America and Asia. The dogs dispersed across the Americas, where they lived for 9,000 years, isolated from the world.

Those were all but wiped out by early American settlers, and most American breeds today more likely trace their roots back to dogs brought to the country subsequently. Those include arctic dogs brought by the Thule people about 1,000 years ago, dogs brought by Europeans starting in the 15th century, and Siberian huskies brought to the American Arctic during the Alaskan gold rush.

By far, the introduction of European settlers and European dogs had the biggest impact on thinning out the ranks of native dogs, the study said.

“We suspect that a lot of the reasons [ancient] dogs were wiped out were similar reasons that Native American populations were destroyed,” Perri said. Europeans could have brought over diseases such as rabies and canine distemper that were probably not present in the Americas before.

Because settlers saw native American dogs as pests, they probably took steps to not let them breed with prized European dogs.

Indeed, out of 5,000 samples of modern dog genes, only five had genes that belonged to ancient dogs, and in those five, the ancient genes made up less than 2 percent of their genomes, Perri said.

The oldest known ancient American dog was found in Koster, Illinois, and lived around 9,900 years ago.

(Photo: Two dogs buried together in Illinois as long as 1,350 years ago; courtesy of Illinois State Archaeological Survey, Prairie Research Institute)

Dogs: We feared, and ate them, and exploited them, before we befriended them

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OK, so it wasn’t love at first sight.

Before dogs became fully domesticated, there were long stretches of time that humans lived in tension with canines — both wolves and dogs — fearing them, eating them, and skinning them for their pelts.

New research published recently in the Journal of Archaeological Science: Reports concludes the remains of dogs found in Western Europe shows that domestication was neither a quick nor tidy affair.

And one that obviously didn’t happen everywhere at once.

As a result, both wolves and dogs were hunted — dogs maybe even more because they were easier prey.

The research is outlined in a recent Smithsonian article.

The researchers analyzed stable isotopes in the remains. Stable isotopes are forms of atoms that leave behind signatures in biological samples, revealing details about diet, environment and other conditions.

Through them, scientist say, they can learn more about the changing nature of the relationship between humans and dogs between the Middle and Late Stone Age. Most researchers agree that the domestication of dogs dates back 15,000 years or more, and that it first occurred somewhere in Eurasia.

“At that time (the relationship) obviously fluctuated,” says Stefan Ziegler, a co-author of the study. “Sometimes people ate their dogs and sometimes they just used them as guard dogs and maybe even pets.”

The recent study could also provide a new tool for archaeologists trying to get a better grasp on whether newly discovered remains are those of wolves or dogs.

Archaeologists have traditionally based their belief on whether remains are those of a dog or a wolf by relying on bone size, but the stable isotopes may provide a better clue, the study says.

“The data show that dogs and wolves must generally have had a different diet, which is reflected in the altered isotope ratios. Dogs could occasionally access human food sources and their diet must have been either more omnivorous or monotonous than that of wolves, depending on the feeding regime,” the authors say in the study.

(Photo: Lateral view of a lumbar vertebra of a Late Mesolithic dog from Germany with several cut marks by a flint knife, by Jörg Ewersen, via Smithsonian)

Why dogs eat poop: A new theory suggests the behavior all goes back to wolves

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If you had to pick the one non-violent behavior that most dismays dog owners, it would likely be when their dog consumes dog poop — be it the dog’s own or some other dog’s.

Most of us can tolerate their incessant licking of their privates. We can laugh off them humping the leg of a house guest. But most humans find their dog gobbling up feces a revolting and inconceivable act, and some — believe it or not — have even cited it as a reason for returning a dog to a shelter.

While traditionally it has been speculated that some dogs (a minority) engage in the practice to make up for some deficiency in their diet, a new paper suggests it may be in their genes, Scientific American reports.

Veterinary researchers at University of California at Davis who surveyed nearly 3,000 dog owners found 16 percent of dogs consume canine feces “frequently,” meaning, in this case, they’ve seen them do it more than six times. In a second survey of just owners of poop-eating dogs, 62% of them were described as eating it daily and 38% weekly.

Benjamin Hart, a veterinarian who directs the Center for Animal Behavior at Davis, reviewed the survey results and the scientific literature on poop-eating, most of which he says is speculative and doesn’t provide any sort of definitive answer for the cause of what’s called coprophagy.

The survey showed no link between feces-eating and other compulsive behaviors. Coprophagy wasn’t associated with age, gender, spaying or neutering, age of separation from the mother, ease of house training, or any other behavior problem.

What coprophagic dogs had in common was this: More than 80 percent were reported to favor feces no more than two days old.

To Hart, that suggests that the cause may go back more than 15,000 years and be rooted, like so much else, in wolves. The new study by Hart and others was published in the journal Veterinary Medicine and Science.

Typically, wolves defecate away from their dens, but at times of urgency, they may let loose nearby. When that happens, other wolves commonly gobble it up while it’s fresh, possibly, some scholars believe, to prevent the spread of parasitic infections.

Feces contain intestinal parasite eggs, which, after a couple of days, hatch into infectious larvae.

Wolves, he said, figured out that by eating any fresh poop left near the den they could be spared being infected by parasites.

“If they eat it right away, it’s safe to eat. They won’t get infected by parasites,” he said.

He theorizes that today’s poop-eating dogs still carry around that wolfy instinct, even though the feces of modern-day pets, consuming modern-day dog food, tend to be parasite-free.

Hart noted there is no shortage of explanations for dogs eating poop.

“For every person you ask about this, you get a different opinion. Because they’re guessing, whether they’re veterinarians or experts in behavior,” he said.

Some believe that stress, or enzyme deficiencies lead to the behavior. Others suspect dogs picked it up as they adapted to scavenging for food sources in human environments. Many dogs will try to eat anything, and poop, from their own or other species, falls into that category.

The study noted that dogs whose owners considered them “greedy eaters,” were far more like to engage in the behavior.

Dog owners responding to the survey sometimes saw their dogs eating poop, and sometimes just surmised as much, based on “tell-tale breath odor,” or because poop in the house was disappearing before they got around to cleaning it up.

While there are products on the marketplace that claim to correct the problem, most of those do little more than make a dog’s own poop foul tasting, according to the Washington Post blog Animalia.

A dog owner can try and correct the behavior, clean up immediately after their dogs, and monitor them closely while they are outside, but the bottom line is — disgusting as it may strike us — dining on feces isn’t that surprising given where dogs come from and what they’ve been through.

As Clive Wynne, director of the Canine Science Collaboratory at Arizona State University, noted:

“The niche that dogs occupy is essentially one of making a living on people’s leavings — and that isn’t just our leftovers from dinner, but what we put down the toilet, too,” he said. “So it’s only from our human perspective that coprophagy seems strange.”

The history and science of dog comes to life in … Zounds! … a comic book!

hirschcoverThink “dogs and comics” and many canine characters comes to mind:

Marmaduke and Snoopy, Underdog and Scooby Doo, Pluto and Goofy –a plethora of cartoon pooches ranging in size, intellect, shape, and colors from blue (Huckleberry Hound) to red (Clifford).

Most of them did little more than provide laughs. Some of them actually passed along some life lessons and knowledge. But none — not even the professorial Mr. Peabody — has displayed the scholarly knowledge of this one.

Meet Rudy, and the man behind him, Andy Hirsch.

Hirsch, through cartoons, words and an energetic narrator modeled after his own dog, tells the story of how wolves transformed into domestic dogs, what’s behind their behaviors and how their relationship to man has evolved in “Dogs: From Predator to Protector“.

It’s the latest title in a graphic nonfiction series from Science Comics that examines science topics ranging from animals, to ecosystems, to technology.

Through Rudy, writer/illustrator Hirsch explores what led wolves to be transformed into the diverse shapes, sizes and breeds of dogs we know today — namely, man.

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“I think it all falls under the umbrella of humans having had a profound influence on dogs. They simply wouldn’t exist without us, especially any sorts of artificial breeds, so a good portion of the book is really about our methods of influence,” Hirsch told Live Science.

The comic-science book gets into the intricacies of doggie DNA and genetics, their exceptional senses, their sociability and their capacity for cross-species communication.

“Humans and dogs have an unmatched partnership all the way at the species level, and to me that means we have a responsibility to understand and care for them,” Hirsch says.

It’s the Texas author’s first nonfiction book, based on his own research, and advice from science consultants including Julie Hecht, a canine behavioral researcher and adjunct professor at Canisius College in New York.

Readers follow Rudy, and his bouncing ball, through a lively series of discussions dealing with the history and science behind how dogs live and behave.

“Maybe it’s something of a cheat to let a tennis ball bounce 25,000 years between panels, but that’s the magic of comics!” Hirsch said. “… The tennis ball was a good way to, well, bounce from one thing to the next. Rudy is our friendly narrator, and though he’s very knowledgeable, he still has the distractible nature of an average dog. That means the bouncing ball never fails to move his attention from one topic to the next.”

Hirsch2-banner“This isn’t a textbook, so when there’s the opportunity to present some facts through an entertaining narrative aside I let the story follow it.”

Rudy is modeled after Hirsch’s own dog Brisco, who he and his partner (all shown at left) adopted.

“Rudy was his first shelter name, and it’s a good fit for a comic book dog,” Hirsch said. “If you get a chance to draw a book full of dogs, of course you’re going to make yours the star.”

A truly commited artist — or at least one who maybe should be

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What do you say about an artist who lays naked with wolves, breastfeeds a puppy, and fertilizes one of her egg cells with a dog’s cell?

Among the words chosen by those commenting on websites describing her work are these: “Psychopath,” “Dear God, the world has gone nuts,” “Disgusting, disgusting, disgusting” and “Someone tell me this is fake news.”

Sorry, it’s not.

Artist Maja Smrekar’s four different projects, combining art with scientific research, go under the name “K-9_topology.”

They started with a fairly tame researching of the physiology of the relationship between humans and dogs. That was followed by posing naked with wolves.

Then she got weird.

smrekarfacebookThe Slovenian artist lived in seclusion for three months with her dogs as part of one.

During that time, she used systematic breast pumping to stimulate a hormone and trigger production of breast milk, and breastfed her puppy Ada to explore “the social and ideological instrumentalization of the female body and breastfeeding.”

That piece of work would go on to be exhibited as “Hybrid Family.”

Then — to explore her “reproductive freedom in a dangerously traveled multi-species world” — she took a fat cell from another dog, Byron, and used it to fertilize one of her eggs using a method similar to IVF. No true pregnancy resulted, according to RT.com.

The artist said on her website that the project grew out of the “observation of zeitgeist through the so called thanatopolitical dimension of contemporary biopolitical practices.”

Do not even ask me what that means. (A video in which the artist explains one of her projects can be found here.)

Despite the bizarre nature, Smrekar’s project has received accolades from art critics and was awarded the top prize in the Hybrid art section of the Prix Ars Electronica, one of the best known prizes in the field of electronic and interactive art.

What did they have to say about it?

“What is making this artwork so special is the total commitment of the artist,” the jury said in a statement.

That commitment, they said, was reflected by “exposing her body to hormone roller-coasters of false pregnancy and organizing the lab infrastructure to execute the complicated biotech protocol in order to create a poetic masterpiece evoking the challenges of post-humanistic dilemma.”

(The word “commitment” does come to my mind in looking at her work, but a different kind of commitment.)

“K-9_topology is a true hybrid artwork with a profound bio-political message,” the judges concluded, “and is certain to bring a lot of discussion to the audience from both the art and science sides.”

Not the words I would choose. To me, it serves as proof that, as weird as scientific research can get, as weird as art can get, combining the two can get exponentially weirder.

Lost in translation: In shedding their wolfish past, dogs lost ability to cooperate

wolfanddog

There’s one thing that wolves are still way better at than their domesticated descendants (aka dogs) — cooperating with their own kind.

Domestication may have led to canines becoming more skilled at cooperating, manipulating and melting the hearts of people, but they lost something in the transition.

While they’ll still run together, play together and display other pack-like tendencies, dogs are less likely than wolves to work together as a team to accomplish a goal, says a new study.

To provide a human equivalent, wolves will work together like a team of Navy Seals, while dogs are more like, well, Congress.

Sarah Marshall-Pescini, from the University of Vienna, has found that dogs lag far behind wolves when it comes to accomplishing a task that requires them to cooperate.

She conducted a simple series of experiments in which dogs have to pull on two pieces of rope to bring a piece of distant tray of food within reach. While the dogs almost always failed, the wolves, working together, frequently succeeded.

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“The idea is that we’ve changed their psychology to make them into super-cooperative beings,” says Marshall-Pescini. But that’s only true for their relationships with humans, she added.

By domesticating dogs, humans ruined the pack instinct that makes wolves such great hunters and survivors.

“They adapted to the niche we provided for them and it changed their sociality,” Marshall-Pescini says.

That applies even to dogs living in the wild. They mostly keep to themselves, scavenging alone on human garbage. When they do form packs, they are usually small and loose-knit.

By contrast, wolves live in extremely tight-knit family groups. They rely on their pack-mates to bring down large prey, and they work together to rear each other’s pups.

Fifteen wolves and 15 dogs currently live in Vienna’s Wolf-Science Center, a facility established to look at the differences between wolves and dogs “in as fair a way as possible,” says Marshall-Pescini.

“They’re raised in exactly the same way, with a lot of human contact. This allows us to test a lot of different things without the confounding variables of wolves not being used to humans and pet dogs being super-used to humans.”

In the experiment, a string was threaded through rings on a tray of food on a side of a cage the animals could not access.

If one animal grabs an end of the string and pulls, it just comes out of the rings. If two animals pull on the two ends together, the tray slides close enough for them to eat the food.

All in all, the dog teams did terribly. Just one out of eight pairs managed to pull the tray across, and only once out of dozens of trials. By contrast, five out of seven wolf pairs succeeded, on anywhere between 3 and 56 percent of their attempts.

As The Atlantic explained it in an excellent summary of the study:

“It’s not that the dogs were uninterested: They explored the strings as frequently as the wolves did. But the wolves would explore the apparatus together — biting, pawing, scratching, and eventually pulling on it. The dogs did not. They tolerated each other’s presence, but they were much less likely to engage with the task at the same time, which is why they almost never succeeded.”

“The dogs are really trying to avoid conflict over what they see as a resource,” said Marshall-Pescini. “This is what we found in food-sharing studies, where the dominant animal would take the food and the subordinate wouldn’t even try to approach. With wolves, there’s a lot of arguing and it sounds aggressive, but they end up sharing. They have really different strategies in situations of potential conflict. [With the dogs], you see that if you avoid the other individual, you avoid conflict, but you can’t cooperate either.”

(Bottom photo: Wolf Science Center/Vetmeduni Vienna)

Researchers say the hyper-friendliness of dogs results from gene mutation

Researchers say they have pinpointed a gene mutation that explains why dogs are so hyper-friendly — one they believe could have played a role in their domestication.

The scientists say they have isolated two genes, variations in which lead to the hyper-friendliness and tail-wagging sociability that most dogs exhibit.

When I read the headlines I had two reactions. First, I didn’t want to believe that the love dogs display resulted from something as stark sounding as a “mutation.” Second, I decided I wanted those genes, and those mutations, inside me — and all humans.

Imagine how much better a place the world would be if we all got so excited we nearly peed when we greeted each other, covered the faces of friends and strangers with licks, and had that unconditional love and loyalty that dogs possess.

Interestingly, though, similar variations in those same genes are already inside a small number of us. The genes at issue — GTF2I and GTF2IRD1 — are the same ones that have been associated with a human disease called Williams-Beuren Syndrome (WBS), which causes developmental disabilities and many other health issues.

The condition is characterized by mild to moderate intellectual disability, unusual facial features, cardiovascular problems and other health issues. But it also can often lead to affected individuals having highly outgoing, engaging personalities and extreme interest in other people.

Having written about people with developmental disabilities for eight years as a reporter, I met more than a few people like that — in institutions, group homes, and living with their families. They’d come up and hug a complete stranger. They’d follow me around, paying attention to everything I did and said. They seemed to indiscriminately love everybody. They were hard to say goodbye to.

I didn’t know it was a result of their Williams-Beuren syndrome, or that there even was a Williams-Beuren syndrome (this was the 1980’s), just that they possessed an innocence and trust uncommon in our species. I can’t remember if, at the time, I saw that behavior as “dog-like.”

But some researchers did.

vonholdtBridgett vonHoldt, an evolutionary geneticist at Princeton University, and Monique Udell, who studies animal behavior at Oregon State University, met three years ago and started talking about dogs.

In an earlier study, vonHoldt had identified a gene that’s mutated more often in dogs than wolves — one that possibly led to their domestication.

Together, Udell and vonHoldt decided to examine the social behavior of a group of dogs and a group of wolves and then analyze their DNA in the region that included the genes in question.

The study they co-authored, using a combination of genetic sequencing and behavioral tests, pinpointed a couple genetic differences that seem to track with friendliness.

Using 16 dogs and eight captive, socialized wolves, they were able to establish that the dogs showed a greater variation, or mutation, of those genes. Animals with these mutations appeared to pay more attention to the humans than those without, the researchers said.

“We find that hyper-sociability, a central feature of WBS, is also a core element of domestication that distinguishes dogs from wolves,” the study concluded.

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The findings, in addition to providing new insights into the human disorder, could explain a large part of what led wolves to become domesticated, and how dogs evolved to become man’s best friend.

To learn more about the study, check out these reports from the
Los Angeles Times, Science and Princeton University.

(Photos: At top, Bridgett vonHoldt, an assistant professor in ecology and evolutionary biology at Princeton and the study’s lead co-author, cuddles with her Old English Sheepdog, Marla, by Chris Fascenelli, Princeton University Office of Communications; at bottom, Lauren Brubaker, a graduate research assistant in the Department of Animal and Rangeland Sciences at Oregon State University and one of the study’s authors, interacts with a gray wolf, by Monty Sloan, via Princeton University Office of Communications)