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Eugine_Nier comments on Evolutionary psychology: evolving three eyed monsters - Less Wrong
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It's not about size of the change, it's about the complexity of the change. Increasing the brain size by four times is not a very complex change; some minor tweaks aren't either. edit: Also, the differences between chimp and human are pretty consistent with plain increase in the volume (and number of neurons), if you control for, hmm, cultural differences. You can teach chimps sign language; chimps can use and invent tools. We do it better, of course - larger brains are more powerful, perhaps the longer childhood also helps, etc.
So would you say the differences in behavior between wolves and dogs, or between different dog breeds, are purely the result of differences in their brain size?
No, very minor simple tweaks like up and down regulation of specific types of neurotransmitters, adjusting the values on already existent responses such as fear, agression, et cetera.