One of our cats has what we think is asthma, too (Leo- 15 years). They tried to treat him first with doxycycline (sp?)- pill form, but he reacted horribly- five days at the vet, had to be syringe fed. So, I bought the Aerokat and an inhaler, and although that is helping some, he still wheezes. We just started him on amoxicllin- hopefully that does something. He's never been on antibiotics before, so I'm hopeful, in the event it is an deep lung infection. I think I'm going to switch to that new walnut litter, too. Tried the wheat, tried the corn, then found out the dust from both of those is really bad (as is the pine), but apparently the wheat is okay, although very expensive, but if it helps it's worth it.