MR. PEAL's suggestion appears to be a probable one, and is supported by Mr. Worthington Smith's observations (NATURE, vol. li. p. 57). The spots may have been protective to the animals during sleep, causing them to look as if awake. The reason that they do not occur in wild dogs may be that the latter conceal themselves when sleeping, which the halfdomesticated animals were not able to do.
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WALLACE, A. Tan-Spots over Dogs' Eyes. Nature 51, 533 (1895). https://doi.org/10.1038/051533e0
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