I have a very large sheep farm in 1.4.2 survival mode. The black sheep seem to always glitch through the fence somehow. It appears to be the only type of sheep that does it. I originally had wood fence down and they kept glitching through the it, I thought maybe switching to cobblestone fence would fix it and they are still glitching through.
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Related to MC-210?

Duplicate of MC-2025
This does not make sense. The color does not affect how a sheep behaves. I assume this is a problem with the layout of your sheep farm. Could you post a screenshot please? Could you move the black sheep to an other place and put other mobs in the glitchy spot?