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Understanding the affects of parasitism on prey population dynamics requires knowing how their predators\u2019 parasite community is affected by diet and prey availability. Ungulates, such as moose (<jats:italic>Alces americanus<\/jats:italic>) and white\u2010tailed deer (<jats:italic>Odocoileus virginianus<\/jats:italic>), are often important prey for wolves (<jats:italic>Canis lupus<\/jats:italic>), but wolves also consume a variety of alternative prey, including beaver (<jats:italic>Castor canadensis<\/jats:italic>) and snowshoe hare (<jats:italic>Lepus americanus<\/jats:italic>).<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>The use of alternative prey, which may host different or fewer parasites than ungulates, could potentially reduce overall abundance of ungulate parasites within the ecosystem, benefiting both wolves and ungulate hosts.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>We examined parasites in wolf carcasses from eastern Manitoba and estimated wolf diet using stable isotope analysis. Taeniidae cestodes were present in most wolves (75%), reflecting a diet primarily comprised of ungulates, but nematodes were unexpectedly rare.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>Cestode abundance was negatively related to the wolf's \u03b4<jats:sup>13<\/jats:sup>C value, indicating diet affects parasite abundance. Wolves that consumed a higher proportion of beaver and caribou (<jats:italic>Rangifer tarandus<\/jats:italic>), estimated using Bayesian mixing models, had lower cestode abundance, suggesting the use of these alternative prey can reduce parasite loads.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>Long\u2010term consumption of beavers may lower the abundance of adult parasites in wolves, eventually lowering parasite density in the region and ultimately benefiting ungulates that serve as intermediate hosts. 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