I got home this afternoon and while the tree is still intact. Waldo isn't.
He has about a 3/4 of an inch long gash just below his eye. It's fairly smooth and kinda deep, but was not bleeding. I have NO idea how he got it. He doesn't need stitches (my professional opinion). I am thinking that maybe Rosie tagged him. She gets really snitty if he won't leave her alone (maybe now he will). I found no blood anywhere in the house and this had to have bled some.
I cleaned it and put neosporin on it which he was not happy with. It doesn't seem to be bothering him.