I don’t know how many peer-reviewed cites you need, but you certainly seem to be skating over any I or anyone else provide. Or maybe you just want a cite that says ‘Gadzooks! We’ve found the gene for biting postmen. It’s 3rd from the left, half way down and it’s a light blue in colour’.
That won’t happen, so all we can do is consider the scientific evidence that actually exists. In this respect, all evidence suggests that there’s a genetic component to behaviour in dogs (and humans). The questions at the moment are to what extent do genes influence behaviour - and obviously, what genes or combinations thereof are important.
Anyway, here’s some more scientific evidence for you to ignore, Saetre et al. (2004). [Mol Brain Res 126: 198-206; DOI:10.1016/j.molbrainres.2004.05.003]. Abstracted from the abstract:
‘We compare gene expression patterns in dogs, wolves and a close relative, the coyote (Canis latrans), in three parts of the brain: hypothalamus, amygdala and frontal cortex, with microarray technology. Additionally, we identify genes with region-specific expression patterns in all three species. Among the wild canids, the hypothalamus has a highly conserved expression profile. This contrasts with a marked divergence in domestic dogs. Real-time PCR experiments confirm the altered expression of two neuropeptides, CALCB and NPY. Our results suggest that strong selection on dogs for behavior during domestication may have resulted in modifications of mRNA expression patterns in a few hypothalamic genes with multiple functions.’
From within the paper:
‘The two wild species in our study, the gray wolf and the coyote, had a very conserved pattern of gene expression in this tissue in spite of having diverged millions of years ago [47]. In contrast with this, the pattern of gene expression in the hypothalamus of domestic dogs has diverged markedly in an evolutionarily short time. This suggests that the domestication process of dogs has greatly accelerated the rate of divergence in gene expression in the hypothalamus.’
They also mention:
‘A long-term study on farmed silver foxes (Vulpes vulpes) in which animals were selected for non-aggressive behavior towards man for more than 40 generations resulted in silver foxes that were docile and friendly towards people.’
This study is discussed in the book The Genetics of the Dog (I think I mentioned it earlier in the thread?) and in Trut et al. (2000) [Genetika 36: 942-946; in Russian, but the abstract’s here].
Anyway lissener, it’s your right to bury your head in a bucket, the bucket in the sand, the sand in a block of glass, and shoot the block of glass into space. None of this will alter the scientific realities.