OMG!!! It looks like a masacre! Poor Mouser, and poor you and your husband having to deal with all that blood. Do you have a recliner that he could have been napping in? Those can grab hold of body parts and injure them if someone sits in them unaware a cat is inside...and it just takes one sizable kitty to jump up at the wrong time.... Hope you can figure it out, and prevent it from happening to any of the others. Kisses to Mouser...poor guy!