[When Shun dismisses the notion of questioning Ludger, Kaneki simply lets the matter go. If he wants to inquire, he knows who to ask, and it's his decision as to whether he will or will not. Even if he had thought to respond, any such considerations would have been effectively derailed by the question that follows]

Do you mean you'd want to work with the cats?

[There isn't any masking his surprise, though Kaneki makes short work of correcting himself and schooling his expression as best he might. But that's after a good solid stare.

Maybe if he just goes ahead and answers, that moment will be forgotten...]

I think someone looking after the cats specifically wouldn't have to focus on customer service like someone in my position would.