My 11 yr old arabian gelding had a bloody nose today. He was acting perfectly normal all day. I was going to go for a ride so I went to get my saddle and when I came back, he had a little bit of blood coming out of his nose. He was being a little hyper and throwing his head because my other horse had left him but I don't think that's the cause... I did notice that he was being flinchy when I was tacking him up but once my other horse got back, he was perfectly fine again.
He hasn't been ridden for about 3 weeks so he is not over-worked. Yesterday it was quite cold outside (about 8 degrees average) and today it warmed up to about the 20's... I don't know if that would have anything to do with it or not? It was also freezing rain...
He is perfectly healthy and has not had any problems before.