i can not think of a way to prevent it in the first place. Will prevent damage when up. Like a cow. But the Bulls did not make the Norsemen. When the Bulls lost to the cow shed was lost, and therefore perished.
I don't think defense first, but find a way to prevent the damage occurred, and then compare it with a cow, but do not brood cow environment. but when the oxen disappeared and then worked up the cow, it is broken.
don't think I find a way to protect them, but first thought was to prevent damage when, and then like a cow, but it is not a stall round cow, cow, and it came to pass when they were gone, it was gone by then. cow.