Kuroneko-sama/That cat from Trigun

So, who loves this cat? Awhile ago i tried to track down all the appearances by kuroneko-sama, i couldn't find one for ep 17 though she's said to appear in every episode and I'm not sure about ep15. Also some cats might not actually be her as they have this brown pattern on the ear? My favourite appearance is ep 11, the one where Wolfwood is trying to cheat XD apologies for the bad audio in some eps