EN
The aim of the study was to determine the frequency of bacterial and mycologic flora in dogs with otitis externa and its sensitivity to selected drugs. Swabs were taken trom 92 dogs with signs of otitis externa. The following strains were isolated from 87 dogs: S. intermedius (51), E. colt (13), Streptococcus spp. (9), P. vulgaris (8), S. aureus (1), S. simulans (1), P. mirabilis (1), K. pneumoniae (1), and P. pachydermatis (36). Gram-positive bacteria were sensitive to gentamicin (91.9%), amikacin (90.3%) and ce- fradine (72.6%), while an increased resistance was found to hnkomycin, penicillin, doxycycline and ampicillin. Gram-negative bacteria proved to be sensitive to amikacin (87 1%) metylmicin (83.8%), gentamicin (67.7%), and partly to doxycycline, cefradine, chloramphenicol and amoxicilline. The isolated strains of P. pachydermatis were most sensitive to ketoconazole (100%) and mycoconazole (88.9%). They were relatively resistant to pimaricine, nystatin and amphotericin B.