Noticed a spider bite on my arm today. Maestro, go get 'em!
Unrelated Question: If a cat has learned not to bite one human, but still selectively bites the other human in the house, is there still a general concern that he will bite non-household humans?
He nips a lot less in general these days, but it still happens at times. Hissing still works like a charm for me, even when he's riled up in play mode. One hiss and he switches to lunging at me with an open mouth but no actual tooth-to-skin contact. Sometimes I don't even need the hiss: I saw "ow!" and he becomes gentler (he may even lick the spot he nipped).
He still seems to nip at SO fairly often. SO refuses to hiss at him because he feels silly doing it, but "No, stop that!" doesn't seem to make much of an impression on the kitty. Maestro's typical tactic is to charge at SO's feet and ankles, biting hard. If SO says "ow!" Maestro just continues biting.