Had all 3 guinea pigs out this morning, all approx. 4 months old, and they seemed fine. Left the room for 5 minutes, came back and realise there are little blood spots all over the carpet. All seem happy, no worrying signs of dominance; then spot Fred in the corner, not seeming angry or anything but just a little quiet in the corner, and realise he's bleeding somewhere from his foot but can't get hold of him to see! I've managed to scoop him into a travel box for the vet now with some hay and things to burrow under, he really seems perfectly happy, although he's tracking blood everywhere. Before I caught him, if left to his own devices he would happily munch on some hay and seemed to have no problem with the other two guinea pigs - they're all boys, about 4 months old and have shown some grumpy-teenager vibes towards one another but nothing worrying. Should I leave Fred to recover on his own or take him to the vet? Does this look like a fighting thing or maybe just an accident?