I don't know what litter you are using - I'm just "passing though" this thread and saw the wheezing thing - and,
just had to mention something ...
I've taken the cover off of the litter box because, no matter how much the litter product says there is little "dust" - there actually seems to be a lot!
I have a black cat, and I didn't realize how much dust he was stirring up until one day he exited from the litter box (with a lid) with white dust all over him - THEN, I took it one step further - and questioned - JUST how much of that dust is he breathing while he's in there? !! That was just too scary thinking I've been making him breath all that dust into his lungs, etc. So, as well as trying to provide the most dust free litter, I've taken the lid off, too.
Just my 2Â¢, hope I didn't get "off topic" for you.
member ladies P. Pod ahahhah