The Asiatic wild dog or dholeCuon alpinusis a threatened social canid that uses a repetitive whistle call to maintain group contact in dense habitats. Spectrographic analysis revealed significant differences between the whistles of captive dholes, allowing callers to be reliably identified. The most important discriminatory characteristics were the period from the start of one syllable to the next, the fundamental frequency, and the maximum frequency. The individual distinctiveness of the whistle is discussed in terms of its functional significance and possible survey applications.