Blood scare / inspection

So I had a bit of a fright several days ago when I saw a good amount of blood all over several of my 2 year old chin Gandalf's shelves, and immediately took steps to take him to the vet. However, he appeared in great spirits, was energetic, happily eating, peeing & pooping normally, and showed no signs that any of his paws / feet were tender or hurting him.

So now I'm starting to suspect that he cut one of his back feet as he had chewed up a piece of pine from an old ladder set and produced...

Blood scare / inspection