BellaBoo! I thought I was the only person in the world who had thought of putting a screen door on my workroom! I find it helps with the yowling (read: three Siamese) when they can at least see me. I won't allow them in there when I'm rotary cutting or laying out pieces or trying to get a quilt on my frame.
But as for that cat hair. Even if I never let any of them in there ever (I have six cats altogether), I would still be carrying the ever present cat hairs in there on my person.
I also smoke, and I have noticed that people trying to sell their work online often post that their quilts were produced in a smoke and pet free environment, which leaves me figuring that I cannot ever sell anything of mine online.
In the past, I have sold numerous pieces made in the same sort of environment, with no complaints whatsoever. I never attached any sort of warning to them, but then that was in the days before everything was "unsafe". How did we oldsters ever live so long, not being protected from everything as folks seem to be these days? But in today's climate of protectiveness, I expect that that warning would be the way to go.
And please, that's not meant to denigrate you people here who have allergies, nor to make you think that I don't understand your problems. Just because I do not live with such things, doesn't mean that I don't have sympathy for you. *S*