When performing otoscopic examinations in dogs and cats, especially ones with severe otitis externa, I put a little Surgilube
(Fougera) lubricating jelly on the otoscope speculum to ease discomfort caused by the examination. Since the jelly is sterile,
you can obtain a sample for culture after the examination, if necessary.
Dr. Carl Zymet, DABVP (canine and feline practice)