If you look at stone age or bronze age settlements there was apparently some sort of “man’s best friend … until he got hungry” attitude going on…
In depth info about domestication of dogs:
O. Thalmann, B. Shapiro u. a.: Complete Mitochondrial Genomes of Ancient Canids Suggest a European Origin of Domestic Dogs. In: Science. (registering required 
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https://de.wikipedia.org/wiki/Doppelgrab_von_Oberkassel (only available in german )
