Affects Version/s: Minecraft 1.8-pre3
Fix Version/s: None
In single player, when you re-login with animals close to fences, they can sometimes escape. To re-create:
1. Make a world and put fences in any shape.
2. Spawn some animals in the fences you placed down.
3. Sometimes, the animals will be at the edge of the fences. Re-log into the world, and sometimes the animal will escape.