1. Serpell, James, ed. The domestic dog. Cambridge University Press, 2017. (start on page 70, available on Google books, too long to quote)
And
2. "We found that a large proportion of behavioural variance across breeds (among-breed heritability) is attributable to genetic factors (figure 1a). The mean among-breed heritability was 0.51 ± 0.12 (s.d.) across all 14 traits (range: h2 = 0.27–0.77), and significantly higher than the null expectation in all cases (permutation tests, p < 0.001). These estimates are also significantly higher than those in previous studies assessing heritability of the same traits in large within-breed samples (mean difference = 0.37, 95% CI = 0.44–0.30; t13 = −12.25, p < 0.001; [44], but see [45]). Incorporating among-breed variance thus yields h2 estimates that are on average, five times higher (range = 1.3–25.5 times higher) than traditional within-breed estimates, which could be due to limited genetic and phenotypic variation within breeds." (MacLean, Evan L et al. “Highly heritable and functionally relevant breed differences in dog behaviour.” Proceedings. Biological sciences vol. 286,1912 (2019): 20190716. doi:10.1098)
General consensus among proper studies is the opposite: behavior is not highly heritable.
https://doi.org/10.1016/j.applanim.2015.06.006
Table 1 is quite extensive. Nearly all of the two dozen studies show less than 10% heritability of the measured behaviors.
Dogma. Prove it. Link to any amount of supporting evidence.