So, last year I had a 12 year old gelding suddenly die on me. I had my horses in a seven acre pasture a mile from the house. I had a guy call me and needed me to come rope a horse for him. I drove down to the pasture to check my horses and load one up to go catch this mans horse. I caught a big gray gelding we own and saddled him up. I had 13 head down there at the time. The 12 year old gelding we called Shadow, was being his typical self. Running around, hogging attention, and acting 100% normal. I left and it took me about 45 minutes to go rope this guys horse and make it back. When I got back, Shadow was standing in a far corner of the pasture by himself. I walked up to him and he was bleeding out of his eyes, nose, mouth and had horrible bloody diarrhea. He staggered around and couldnt move any muscles in his face. I immediately called the vet and they headed my way. But right after I got off the phone with the vet, Shadow hit the ground and died. :( The vet arrived and was baffled and no one can figure out exactly what happened. Can anyone explain this?? Thanks!!