I myself am allergic to hay, dust and mold. I am actually allergic to dust mites that live in the dust which I think is part of the reason some hays and beddings bother me so much. I found switching to aspen litter pans and fleece has cut down on a lot of my allergies. Other than the dust getting into my nose and making me feel itchy when they dust, if I am too close, I don't usually have an issue with their dust. However, I recently discovered that one of the Oxbow hays is bothering me more than the others. It's the orchard grass hay. It's so bad I've contemplated throwing out the rest of the bags. Instead I'm feeding just it until it's gone as the girls gobble so much hay I hate to waste any. Since I bought it I've had itchy burning eyes, itchy nose and respiratory problems. Part of the thing I do to help this is I clean up the hay thrown around the cage more frequently. I am also wary of hay cubes as the girls do munch at them a bit but not like they do with the loose stuff. I also worry about the wearing down of their back molars. I really hope you find a solution and do not have to get rid of your chins. How do you store your hay? The amount of hay in the cage at a time might not be as bad on his allergies as the whole bag. For me as gross as it sounds I've actually had the most issues I think due to mold. My malo guy use to pee a ton in the same spots and I believe mold spores can grow very quickly, and not be obvious to the naked eye. Mold is everywhere. When I had him and he was on just the apsen I had to spot clean daily or it would drive my allergies up the wall. Apparantly whatever I'm doing is helping because I had a bag cough and chest congestion for a months and now it's finally cleared up. I am not sure if your boyfriend is willing to try this or if he has the insurance to cover it, but has he seen an allergist? Discussed allergy shots? I got these for about 3 years for animal allergies, dust and mold and after that time I could walk into the Humane Society and still breathe. I've regressed a little bit after being off them but they aren't very painful and really do provide a lot of relief.