I often wonder why people have livestock in those areas, what are you supposed to do if a big tornado comes?
A lot of it boils down to: God's Will.
I certainly don't own a mile section and I have livestock, horses, chickens and barn cats. The only animals that will be able to go into the storm shelter will be the dogs.
I depend on the Storm Chasers and the NOAA weather radio to give me lots of advance warning before something like that tornado hits me. I knew at 2 pm that something BIG was brewing over Moore because I was watching the wall to wall storm coverage on TV. At 2:05 I went out to finish picking stalls, lay dinner, fill waters and bring in my animals. I carried my NOAA weather radio with me so I would know if anything started heading my way. At 2:45 when the tornado touched down near Newcastle, I started to hustle a little more. By the time the wind and rain had really started to get close I was dumping my last load of manure and calling in the last 4 horses. We got into the barn just as the squall really hit and it got noisy because of the hail. Because of the NOAA weather radio keeping me weather aware that day, not one single chicken or horse got pelted with hail or even really got wet. I got the wettest because I chose not to weather the whole storm in the barn.
Now, I'm 70 miles north of Moore, so was never in danger from THAT tornado. If I had lived in Moore, I would have done exactly what I did but maybe a little earlier because the news had been watching that storm for quite a while, it cycled up and cycled down several times, before it turned into a full on tornado. Even when it became a tornado it wasn't nearly as big as it finally grew, there was no way to tell what it was going to end up as, until it did.
You do what you can, you pray and give it to God. It's all you CAN do. If the tornado had been coming straight at us, I'd have taken some livestock paint and put my phone # on each horse, that's the only other thing that can be done, so you can be notified where to come get them if the survive and get loose.
97% of the time, the tornado will miss you, heck maybe even 99.9% of the time. Most of the time, you'll get hit by a bus before you'd get hit by a tornado. It's just when you do, it's pretty awful.