Previous reports indicate that younger individuals are more prone to development of otitis externa and these same studies document no gender predilection ( 5). Selecting antibiotics for treatment can be problematic due to the bacterium’s resistance to many classes of antibiotics, and treatment is further complicated by the growing number of multidrug resistant strains ( 3, 4). It is not a normal inhabitant of the canine ear and when it leads to infection, it can be challenging to manage ( 1, 2). Pseudomonas aeruginosa is a ubiquitous Gram-negative bacillus found in soil, water, and decaying organic matter. are among the most common bacterial pathogens in cases of infectious otitis externa, with Pseudomonas aeruginosa being the most common Gram-negative isolate ( 1, 2). Pseudomonas aeruginosa, Staphylococcus pseudintermedius, Escherichia coli, and Klebsiella spp. In many instances of otitis externa, secondary infection with bacteria or a fungus such as Malassezia pachydermatis, will be present. Otitis externa is defined as inflammation of the external ear canal consisting of the pinna, and the vertical and horizontal ear canals up to the level of the tympanum. In general practice, the percentage of canine cases presenting for otitis externa ranges from 7.5% to 16.5% ( 1). Otitis externa is a common complaint in veterinary medicine.
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