Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vulpīnus (volp-), a, um, adj. [vulpes], of or belonging to a fox: lingua, Plin. 28, 11, 47, § 172: jecur, id. 28, 13, 55, § 197: sanguis, id. 32, 5, 16, § 44.