While looking at the textures of a cow, I realized that the belly didn't match the back, because the parts of the udder was incorrect. The udder is shifted one pixel to the right (right as in perspective of the cow) and therefore it doesn't match the physical udder itself.
I have posted about this problem at the link below with a picture without the udder to show you the problem:
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Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
The picture on the page that's linked in the description isn't there anymore. Please update picture or link.
Confirmed in Minecraft. http://imgur.com/j5h1v