That doesn't mean he should be put down. He could go into a home without another cat, or with other cats that also tested positive. I am shocked they said that.
Is PetSmart supposed to put a warning label on the cat adoption pen?
And if they did, what are the chances of that cat getting adopted?
"No-Kill" is a dream, but it is not necessarily attainable. There are animals that pose serious health risks, to themselves, to other animals, and to the humans that care for them. At some point, practicality has to enter into the formula. Sorry, that's just how I see it.