Right now, my local shelter only has one declaw (another came in with her but has since been adopted, both were older kitties)...but because they were just tossed into the dog kennels after-hours,
we have no idea why
they might have been surrendered. Neither showed any behavioral problems, but the one who is left is my poor, sweet, sick senior lady that nobody wants, and she is having a very hard time of it.
Because we're contracted to many towns to take strays, there are a lot of times that we have to turn away owner surrenders (we have been full for quite a while). Most of our kitties are strays, or kittens who came in with their stray mothers and are growing up in the shelter...so most of them have no known history.
As far as special-needs kitties, we have had a few one-eyed cats, there are a few who have chronic UTI's, and one or two with suspected food allergies (which is really hard to deal with when you're relying on donated foods). And, my big, aggressive favorite Mr. Bojangles is being vetted this week because he's started showing some possible early signs of diabetes, and this just as we're getting him to the point where he'll tolerate being handled without biting.
We have no FIV or FeLV cats, because we just don't have the space to segregate them from the general population. I would think that many kill shelters euthanize "problem" and special-needs cats quickly, so that you might not see as many of them on the adoption floor as you'd expect, but I'm just guessing.
Currently, we're lucky to not have any big abuse cases, but there are other shelters further north (especially in more economically depressed areas) who are dealing with multiple puppy-mill and animal hoarding/neglect cases...we just don't happen to have any at this time. <knocking wood>