you will want to count the number of breathes when he's sleeping. it should be 30 or under. Honeybee was 45 breathes a minute in her sleep. now it's 30-35. it's definitely better.
also no more perfume or fabric softner.
no scented chemicals or candles. Just like people who have allergies...you have to eliminate this..dust is a big deal. My home is forced hot air and I struggle daily to clean the dust. She is long haired and seems to collect dust all the time..I just don't have the time to deep clean like I should but I try to do some every week. Here it is March and we still got snow a few days ago...I was hoping spring/summer would get here sooner...because once the furnace shuts off she gets much better. We also have an air purifier=whirlpool whisper I think it's called..its $300 at Sears but works the BOMB. I've got it on turbo setting lately due to the dust. I need another one but right now don't have a place to put it.
anyways check out feline asthma and see what you find.
We use the Aerokat and you can find videos on youtube..honeybee only took a few days to train=trick is leaving it on the floor and let her sniff it...and treats..and treats...everytime I put it on her face-head and she didn't pull away I gave treats...soon she figured out that mom feeds her if she lets me put this strange mask on her muzzle. So it does take time to train...but it's doable.