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" Of the more than 5,500 mammals living today , dogs are arguably the most remarkable , " said senior author Eric Lander , director of the Broad Institute , professor of biology at MIT and systems biology at Harvard Medical School , and a member of the Whitehead Institute for Biomedical Research . The dog was very much distressed at the thought of losing his friend , but the elk took the matter calmly , and seemed neither glad nor sorry . The dog is surprisingly gentle with these very young animals , all less than 6 months old . Several dogs were severely emaciated and frightened ; one had already apparently died of starvation , and the other animals had begun feeding on his remains .