A mask??? Nope. never even thought to use one, and i've had cats since I was little bitty. The smell never really bothers me, unless it's right after they deposit a fresh present... then of course, whatever shirt i'm wearing goes over my nose for that moment in time...

Now cleaners around the house are another matter.. there are some i've tried (and promptly quit using) that smelled so awful, that a mask would have been great!

Although, if i get pregnant sometime in the far off future, I told my husband he'll be on litterbox duty.. somehow I don't see that happening.. so you know.. lol.. but all mine are indoors, so it shouldn't be a problem.