Between blotch and blok

Cat--of the Shadow-y variety--was scooting himself across the carpet yesterday afternoon. M took him to the vee ee tee this morning for the expected diagnosis:
( Cut for Ick )
I've just noticed that my tags include the polite names of many gentleman cats (Mssrs Big, Oswald, Socks, Shadow) and one other similarly named non-cat: Mr Spock.