It's raining today. I woke up and there were puddles everywhere. No wind, just rain. It's not even that cold(I'm went to feed in a T-shirt, no umbrella-I'm crazy ). I noticed that one of my horses was shivering. It wasn't big shivers, just small ones around his shoulder and flank. He has plenty of hay, and I gave him extra grain. I'm getting ready to make him a nice warm bran mash also. None of my other horses were shivering, and they were all soaking wet also(although they have a large run in shed). To be prepared for future days like this, I'm going to buy him a blanket for the rainy days. Is there anything else I can do for him today? Or any illnesses I should watch out for?