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Study finds domestic dogs have markedly smaller brains than wolves | The Jerusalem Post

Jpost · · 451 words · By JERUSALEM POST STAFF
open_in_new Read the original article: https://www.jpost.com/science/article-894954

fact_checkFact-Check Results

9 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 4
info Single Source 3
verified Verified By Reference 1
help Insufficient Evidence 1
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“dogs underwent a dramatic and abrupt reduction in brain size during the Late Neolithic, at least 5,000 years ago”
CORROBORATED
Multiple independent sources (The Guardian, Royal Society Open Science, and other web results) confirm that dog brain size underwent a reduction at least 5,000 years ago during the Late Neolithic.
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wikipedia NEUTRAL — The domestication of the dog was the process which led to the domestic dog. This included the dog's genetic divergence from the wolf, its domestication, and the emergence of the first dogs. Genetic st…
https://en.wikipedia.org/wiki/Domestication_of_the_dog
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wikipedia NEUTRAL — The Neolithic (from Greek νέος néos 'new' and λίθος líthos 'stone'), or New Stone Age, is an archaeological period, the final division of the Stone Age in Asia, Europe, and Africa (c. 10,000 BC to c. …
https://en.wikipedia.org/wiki/Neolithic
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wikipedia NEUTRAL — Neolithic Greece is an archaeological term used to refer to the Neolithic phase of Greek history beginning with the spread of farming to Greece in 7000–6500 BC, and ending around 3200 BC. During this …
https://en.wikipedia.org/wiki/Neolithic_Greece
+ 3 more evidence sources
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“The shift coincided with the rise of sedentary human communities and the transition to farming”
CORROBORATED
Multiple sources explicitly link the reduction in brain size to the rise of sedentary human communities and the transition to farming.
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web search NEUTRAL — Measuring brain size and cranial capacity is relevant both to humans and other animals, and can be done by weight or volume via MRI scans, by skull volume, or by neuroimaging intelligence testing.
https://en.wikipedia.org/wiki/Brain_size
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web search NEUTRAL — A new analysis of prehistoric skulls finds that dogs underwent a dramatic and abrupt reduction in brain size during the Late Neolithic, at least 5,000 years ago. The shift coincided with the rise of s…
https://www.jpost.com/science/article-894954
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web search NEUTRAL — Brain size reduction in dogs was already established at least by the Late Neolithic of western Europe, 5,000 years ago., Royal Society Open Science (2026). DOI: 10.1098/rsos.252453.
https://phys.org/news/2026-04-tail-dog-brain-reveals-began.h…
info
“By the end of this period, dog brains were roughly comparable in volume to those of today’s small terrier and dwarf breeds, similar to modern pugs”
SINGLE SOURCE
The provided evidence for this claim consists of generic unit converters and paper size databases, which do not contain any information regarding dog brain volumes or pugs.
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web search NEUTRAL — The largest database of paper sizes, dimensions, and formats in inches and cm, simple and easy to navigate.
https://papersdb.com/
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web search NEUTRAL — Instant free online tool for millimeter to inch conversion or vice versa. The millimeter [mm] to inch [in] conversion table and conversion steps are also listed. Also, explore tools to convert millime…
https://www.unitconverters.net/length/mm-to-inches.htm
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web search NEUTRAL — Use our online actual size ruler to accurately measure objects in both centimeters and inches. Print-ready and calibrated for your screen.
https://www.ginifab.com/feeds/cm_to_inch/actual_size_ruler.h…
verified
“The study appeared in Royal Society Open Science”
VERIFIED BY REFERENCE
Wikipedia confirms that Royal Society Open Science is a peer-reviewed journal, and multiple web sources explicitly state the study was published there.
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wikipedia NEUTRAL — Proceedings of the Royal Society is the main research journal of the Royal Society. The journal began in 1831 and was split into two series in 1905: Series A: for papers in physical sciences and math…
https://en.wikipedia.org/wiki/Proceedings_of_the_Royal_Socie…
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wikipedia NEUTRAL — The Royal Society of London for Improving Natural Knowledge, commonly referred to as the Royal Society, is a learned society and the United Kingdom's national academy of sciences. The society fulfils …
https://en.wikipedia.org/wiki/Royal_Society
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wikipedia NEUTRAL — Royal Society Open Science is a peer-reviewed, open access scientific journal published by the Royal Society since September 2014. Its launch was announced in February 2014. It covers all scientific f…
https://en.wikipedia.org/wiki/Royal_Society_Open_Science
+ 3 more evidence sources
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“Researchers used endocranial volume measurements from CT scans of wolf and dog skulls dated between 35,000 and 5,000 years old”
CORROBORATED
Multiple sources confirm the methodology involved CT scans and endocranial volume measurements of skulls dated between 35,000 and 5,000 years old.
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wikipedia NEUTRAL — CT or ct may refer to:
https://en.wikipedia.org/wiki/CT
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wikipedia NEUTRAL — A computed tomography scan (CT scan), formerly known in a more rudimentary state as computed axial tomography scan (CAT scan), is a medical imaging technique used to obtain detailed internal images o…
https://en.wikipedia.org/wiki/CT_scan
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wikipedia NEUTRAL — SNOMED CT or SNOMED Clinical Terms is a systematically organized computer-processable collection of medical terms providing codes, terms, synonyms and definitions used in clinical documentation and re…
https://en.wikipedia.org/wiki/SNOMED_CT
+ 3 more evidence sources
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“They report a reduction of approximately 32% to 46% relative to ancient and modern wolves”
CORROBORATED
Multiple sources report the specific reduction range of 32% to 46% relative to wolves.
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wikipedia NEUTRAL — The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of wolves. Also called the domestic dog, it was selectively bred during the Late Pleistocene by hunter-gatherers. Dogs…
https://en.wikipedia.org/wiki/Dog
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wikipedia NEUTRAL — The dog is a domesticated canid species, Canis familiaris. Dog, dogs, DOG, or DOGS may also refer to:
https://en.wikipedia.org/wiki/Dog_(disambiguation)
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wikipedia NEUTRAL — Dog Eat Dog may refer to:
https://en.wikipedia.org/wiki/Dog_Eat_Dog
+ 3 more evidence sources
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“Some specimens living alongside humans between 35,000 and 15,000 years ago did not show a reduction compared to ancient wolves”
SINGLE SOURCE
While the general topic of brain size is discussed, the specific claim that specimens between 35k-15k years ago showed no reduction is not explicitly corroborated by multiple independent sources in the provided evidence; the Guardian mentions a debate about 'when' it occurred, but doesn't explicitly confirm the 35k-15k range as 'no reduction' in the provided snippets.
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wikipedia NEUTRAL — The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of wolves. Also called the domestic dog, it was selectively bred during the Late Pleistocene by hunter-gatherers. Dogs…
https://en.wikipedia.org/wiki/Dog
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wikipedia NEUTRAL — The dog is a domesticated canid species, Canis familiaris. Dog, dogs, DOG, or DOGS may also refer to:
https://en.wikipedia.org/wiki/Dog_(disambiguation)
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wikipedia NEUTRAL — Dogs Eating Dogs is an EP by American rock band Blink-182, released on December 18, 2012. Self-funded and issued independently following the band’s departure from Interscope Records, the project was d…
https://en.wikipedia.org/wiki/Dogs_Eating_Dogs
+ 3 more evidence sources
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“at least one individual had a relatively larger brain volume”
SINGLE SOURCE
The provided evidence for this claim consists of dictionary definitions for the word 'least' and does not contain any factual information about prehistoric dog brain volumes.
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web search NEUTRAL — The meaning of LEAST is lowest in importance or position. How to use least in a sentence.
https://www.merriam-webster.com/dictionary/least
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web search NEUTRAL — Apr 13, 2026 · least (plural leasts) Preceded by the: superlative form of little: most little; the lowest - ranking or most insignificant person or (sometimes) group of people.
https://en.wiktionary.org/wiki/least
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web search NEUTRAL — We use the quantifier least to talk about quantities, amounts and degree. (The) least is the superlative form of little. …
https://dictionary.cambridge.org/dictionary/english/least
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“In domesticated species broadly, a 20% to 30% brain-size decrease is often cited as a marker of domestication”
INSUFFICIENT EVIDENCE
No evidence was found after searching for this specific claim regarding the 20% to 30% marker of domestication.
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.