fences

I think this is visual issue.

no, they really walk away! And the same problem with pigs!

Better?

As of 13w09c animals can still escape fences, I've tested it out with color coded sheep personally. It seems that they can escape from the wood fences, nether brick fences, cobble, and mossy. They do not seem to escape from fence gates. The chunk does not have to load or unload for them to escape. I've been testing in single player, idling close to all the pens. they seem to escape at higher rates when the chunk loads or unloads. They seem to be able to escape from cobble and mossy fences at a higher rate than wood and nether brick fences.

Hope something out of that will help. Can't load my main world cus I was wool harvesting when I last played and the little buggers keep getting out while I'm trying to shave them T_T

yes that is my problem to. Good explanation. Only it is sinds 13w06a until now

I have the same problem with chickens now =(