According to a paper published in Nature, the steps in the dog's evolution away from the wolf is marked by the appearance of genes that enable it to digest human food.
Axelsson, E., Ratnakumar, A., Arendt, M., Maqbool, K., Webster, M., Perloski, M., Liberg, O., Arnemo, J., Hedhammar, �. & Lindblad-Toh, K. & (2013). The genomic signature of dog domestication reveals adaptation to a starch-rich diet, Nature, DOI: 10.1038/nature11837
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