That is a really good idea. Right now, I have to pull them out of cattery into inventory to let them "starve" there

until I can afford to PermaPet them. It would be really nice to have a way to just single them out in the cattery.
Along the same lines, it would be so nice if I could create sub-folders in the cattery, so that I could quickly find the kitties who are being groomed for a particular project. At the moment, I am running half a dozen alts to manage different breeding projects. This get unwieldy. In the real world, at my paid job, I arrange my inbox folders and my MS Word files for easy access to specific projects. Wish the same were true for my "fun" job!