Hello, i have rescued a guinea pig and have had him 8 months. He has chronic lung/respiratory problems with scarring on the lungs and a constant chrunching/rasping sound when he breathes. Over the past few months we have tried different antibiotics to treat it, enrocare & doxycycline, as well as the use of bisolvon and more recently nebulising with F10 solution. So far nothing has helped and he is not getting better. The vet has suggested using steroids, he warned it could make things worse but also hopefully it could make things better. He has had a steroid injection and will start with an inhaler in a couple of days and if there is no improvement with that he will move onto oral steroids. I've read some bad things about steroids in guinea pigs, specifically they can make respiratory problems worse & even fatal so i'm very cautious. He has got problems and i understand nothing else has helped and this is a last resort but i am still concerned. It may sound nuts given that he has such serious chest problems, but he is actually a very happy little guy and i don't want to do anything that may cause additional harm or end his life prematurely. I was just wondering if anyone has had any experience of this and can offer any advice. Thankyou.