One of my cats has been struggling with a bad cough. He also sneezes. At first when I heard him coughing, I thought it was hairballs. But when I heard him also sneezing, I realized it was something else. Long story short, took him to the vet. He didn't cough or sneeze while we were at the vets, so the vet acted like nothing was wrong, said some cats get this and never really get over it. He said giving antibiotics doesn't help, they just have to live with it. I should mention I have five other cats, and they aren't having a problem. I remembered that several years ago my cats were passing a cold amongst themselves and one cat was having trouble getting rid of it and he was prescribed antibiotics, which cured him. After reading a bit on the Internet, I called the vet and asked to try antibiotics on this cat. He prescribed Clavamox. To my delight, the coughing and sneezing completely went away by about day 4 of the 7 day treatment. But two weeks later, the cat has started coughing and sneezing as bad as ever. I'm thinking of calling the vet tomorrow and asking for a longer run of antibiotics. I remember reading something on the Internet that this kind of thing may be tough to beat and they may need to be on antibiotics for a longer term. Anyone had any experience with this?