Thank you everyone for your suggestions, I will definitely be looking into those brands that were mentioned. Yes, this Arm & Hammer seems to generate a dusty cloud that when I pour new litter, I have to hold my breath and jump aside until it 'settles'. I don't mind spending some more on cat litter if it means the dust situation will go down. So far he hasn't exhibited that wheezing again (unless he's done it when I'm not around but I am at home quite a bit). It sure is wonderful to have these boards as a resource for information instead of trying to figure things out by elimination....there are a number of cat litters on the market.
Thanks again!, Lori