The ears of cats and dogs often get infected. Many organisms may attack the area, which include pseudomonas, staph, strep, viruses, amoebas, proteus, klebsiella, and yeast. The offending yeast in particular is malassezia, an organism resistant to almost all other antiseptics or antibiotics. Similarly, pseudomonas is resistant to nearly every antibiotic. 
Earigant SP liquid is a breakthrough in chlorine dioxide technology.  It is presented in a single part system.  Squeeze a few drops directly into the ear and it treats the infection caused by any organism. Importantly, the bacterial cause need not be determined first for this therapy.  The product is water-soluble and allows for easy rinsing of the ear canal.