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Several Russian zoologists after the October Revolution cast doubt on the veracity of records involving wolf-caused deaths. Prominent among them was zoologist Petr Aleksandrovich Manteifel, who initially regarded all cases as either fiction or the work of rabid animals. His writings were widely accepted among Russian zoological circles, though he subsequently changed his stance when he was tasked with heading a special commission after World War II investigating wolf attacks throughout the Soviet Union, which had increased during the war years. A report was presented in November 1947 describing numerous attacks, including ones perpetrated by apparently healthy animals, and gave recommendations on how to better defend against them. The Soviet authorities prevented the document from reaching both the public and those who would otherwise be assigned to deal with the problem. All mention of wolf attacks was subsequently censored.

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Beringian wolf
Isotope analysis can be used to allow researchers to make inferences about the diet of the species being studied. Two isotope analyses of bone collagen extracted from the remains of Late Pleistocene wolves found in Beringia and Belgium indicate that wolves from both areas preyed mainly on Pleistocene megafauna, which became rare at the beginning of the Holocene 12,000 years ago. The Beringian wolf preyed most often on horse and steppe bison. In the period leading up to the Last Glacial Maximum (50,000 YBP–23,000 YBP), they also ate woodland muskox, and after this time they also ate mammoth. The analysis supports the conclusion that these wolves were capable of killing and dismembering large prey.

In another stable isotope analysis, half of the Beringian wolves were found to be musk ox and caribou specialists, and the other half were either horse and bison specialists or generalists. Two wolves from the full-glacial period (23,000–18,000 YBP) were found to be mammoth specialists, but it is not clear if this was due to scavenging or predation. The analysis of other carnivore fossils from the Fairbanks region of Alaska found that mammoth was rare in the diets of the other Beringian carnivores.

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