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We tend to think wolves became dogs because humans tamed them, but a 2025 study suggests the story may have begun the other way around — with less fearful wolves feeding near human camps, then breeding only with others like them until two distinct p – Space Daily
Aug
The taming of wolves may have never required a human hand—just a garbage pile and the patience of generations.
By Daniel Moran
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Every dog that has ever parked itself beside a dinner table, radiating patience and quiet moral pressure, is running software older than agriculture.
Where that software came from is one of the odder fights in evolutionary biology. In the familiar version, humans took wolf pups, hand-reared them, culled the biters and eventually arrived at labradors. The rival account reverses the direction: the wolves did the choosing. Bolder animals crept toward camps for the scraps, ate more reliably than their nervous cousins, and drifted away from the wild population over thousands of years.
Trouble with that account was always arithmetic. Archaeology and genetics place the first phase of domestication somewhere between 30,000 and 15,000 years ago, with the breed-making, human-directed phase arriving afterwards. Fifteen thousand years is not much time for a large predator to become something that fetches.
Five mathematicians decided to test the arithmetic rather than argue about it. In a paper published in Proceedings of the Royal Society B, David Elzinga, Alex Capaldi and three colleagues built an agent-based model: a population of individual simulated canines, each carrying an age, a sex, and one number between zero and one measuring how much it could stand being near humans. Zero bolts. One begs.
Food arrived each simulated year in two flavours, wild and human. Tolerant animals competed better for scraps, skittish ones for prey, and anything that missed out starved. Survivors bred, pups inherited a tolerance close to their parents’, with the odd mutation thrown in, and the clock ran for 15,000 years. Every decade, a statistical test asked whether the population had pulled apart into two distinct groups.
Averaged across all the model’s default runs, that split happened about 37 per cent of the time. Split that figure by one setting, mate preference, where females favour males whose temperament resembles their own, and the picture changes completely. With mate preference switched on, divergence happened in roughly 74 per cent of runs, arriving after a median of about 8,000 years. With it switched off, the result was zero. Not rare. Zero, across every run inside the window.
Capaldi, a statistician at James Madison University, told Live Science that with both mechanisms running, self-domestication can “beat the time constraint critique”. Tolerance was pulling double duty inside the model, sorting who ate and who bred at the same time.
Ecology on its own never got there.
One paper, one model, and the authors say as much. Their results don’t settle how early domestication actually happened; the narrow claim is that a shortage of time cannot on its own sink the idea. Across a wide sweep of parameter values in the sensitivity analysis, divergence showed up in only 6.7 per cent of simulations, and the volume of human food scraps proved to be one of the variables that mattered most.
Some of what the model leaves out matters as well. Humans never appear as agents in it. There is no map, no distance between one camp and the next, no pack structure. Elzinga and his co-authors flag the missing geography themselves and note it could push the result either way. Isolation between valleys might hurry a split along. Thin pickings in sparsely settled country could smother tame mutations before they spread.
That reliance on food volume cuts against the hypothesis the model was built to defend. Christoph Jung and Daniela Pörtl, writing in Dog Behavior, worked through nine assumptions behind the scavenging story and reported finding support for none of them, arguing that dogs appear in the record thousands of years before humans were generating rubbish heaps worth raiding.
James Serpell’s critical review in Frontiers in Veterinary Science raises the social objection. Prehistoric hunter-gatherers had every reason to see a bold, human-tolerant wolf as a threat rather than a future pet, and to drive it off or kill it before it could pass that tolerance on.
Then there is the animal itself. Debra Mitts-Smith, writing in International Wolf and summarising a Mammal Review paper by David Mech and Luc Janssens, notes that wild wolves are profoundly wary of people, and that any wolf old enough to be raiding a waste heap was old enough to have learnt fear. Food still sits at the centre of their account, though humans hold the active role, feeding and rearing pups into dependence.
Genomes are good at pinning down when and where domestication happened. On why, they go quiet. Anders Bergström and colleagues, publishing in Nature in 2022, sequenced 72 ancient wolf genomes spanning the last 100,000 years and found that dogs overall trace closer to ancient wolves from eastern Eurasia than to those from the west, with the pattern pointing to more than one wolf population in the mix. None of that settles who approached whom first.
So the argument stays open, and the 2025 model leaves behind an odd little requirement. For wolves to have domesticated themselves fast enough to match the timeline, a taste for leftovers was not enough. They also had to be choosy, generation after generation, until the ones who liked people were breeding only with others who liked people. Snobbery, of a sort, running for eight thousand years.
Which makes the modern dog the great-great-grandchild of a very choosy wolf, one that held out for a mate who liked people just as much as it did.
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Daniel Moran is a writer at Space Daily covering the intersection of psychology, technology, and human behavior. He is one of the publication’s most prolific contributors, writing across the Mind & Meaning and Science pillars. Daniel brings a background in technology research and a focus on how scientific findings translate into the way people actually live, work, and think.
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