No, there is very little scientific evidence of any relationships between coat color and behavior, other than the studies I cited above… that’s what made these so interesting. They are very preliminary, of course, but thought-provoking, and all the more so because we now understand how coat color is controlled through the genes in dogs, according to a more recent study that I found while researching your question.

So we know how chocolate, and most other coat colors, are produced in dogs (the same genes, it appears, that determine coat color in all other mammals). This allows us to understand how coat color might be related to, or “predict”, behavior, at least, behavior which has a genetic component to it, as we believe that most behavior does.

So, other than a study from a few years ago that indicates that chocolate-coat dogs are slightly more likely than random to be adopted from shelters (brindles were significantly LESS likely to be adopted), there is no other scientific literature on coat color and behavior!