I went out to feed tonight, and practically fell over when I saw Mojo's tail. I took him out of the paddock, tied him up, and got a better look. He was missing about 2 inches worth of hair on the base of his tail! At first I thought it was from him rubbing it from worms, but he was dewormed recently. But after I took a closer look I realized it was rain rot, and boy did he have it bad. I got out some anti-fungal shampoo, and washed his entire tail, hind legs, etc. And that's when his hair started to fall out. He has almost no hair on his tail anymore. I was shocked. I board him and my mare at my friends stable, and we all take turns coming out to feed. I was out here two nights ago, and he was fine. I've dealt with rain rot before, but nothing like this. Does it really spread that quickly? I'll have to post some pictures up asap. It seems like one problem after another with this little guy. I guess this is what I get for buying a $25 pony.