I live in the country, so I naturally have over a dozen farm cats. As a student, I could never hope to afford vet bills for all of these cats. One day, a new cat showed up, with a scabbed up ear. Recently,the ear is far, far worse. I don't want to lose the cat, because she takes care of the other cats, but I don't want this infection to spread to any of the others. I don't know what I can really do in this situation..