A 6-year-old male Cocker Spaniel dog has recurrent otitis externa. Microscopic examination of a smear of purulent discharge from the ear shows large numbers of rod-shaped bacteria. Which of the following is the most likely causative organism?
a. Escheria coli
b. Klebsiella spp
c. Pasturella multocida
d. Psuedomonas aeruginosa
e. Staphylococcus intermedius