A bloody nose in a horse can be a sign of something serious, or the result of a strenuous workout, but one like this is most likely from horseplay - a simple bump on the nose. Earlier in the day I watched Code Red and Remi nipping at each other's faces in play. They dodge those nips pretty well, but still, when a thousand-pound animal swings its head around for a playful nip, you'd better be ready to duck. I'll be watching Code Red to make sure this isn't a frequent occurence, in which case the vet will have to investigate. But my bet is the cause of this little nosebleed is Remi. Boys.