I had wondered about this, because it has been stated that animals are exempt from karma but I had a particulary special cat (Merlin was his name and nature) who, like many cats enjoyed hunting and delibrately harming animals, he was killed under a neighbors house by another cat the same way he used to take his creatures. It seemed different and I wondered if he had actually individualised to the point that he was accumulating karma. Bless his kitty socks, I'm sure he's on to other adventures now.