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NancyLebovitz comments on Open thread for December 17-23, 2013 - Less Wrong
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Most of the selective breeding has been done while these animals were on simple diets, so perhaps some genetic adaptation has happened as well. Besides, aren't carnivore diets quite monotonous in nature anyway?
There's probably seasonal variation-- Farley Mowat described wolves eating a lot of mice during the summer when mice are plentiful. Also, I'm pretty sure carnivores eat the stomach contents of their prey-- more seasonal variation. And in temperate-to-cold climates, prey will have the most fat in the fall and the least in the early spring.
It wouldn't surprise me if there's a nutritional variation for dry season/rainy season climates, but I don't know what it would be.