Mobs (in particular sheep and cows), pass through fenced in areas. For example: while holding a piece of wheat a Sheep follows me, it is trapped in a Cobblestone fence area and after a while(varying from 5 seconds- 30 seconds) the sheep moves through the fenced area out to the open where it may roam off accordingly.
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I'm experiencing cows glitching through fences in 1.6.2 for the PC as of July 22, 2013
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Still not a reason to create countless duplicates of the same issue.
Duplicate of MC-2025, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being resolved as duplicate.