ear infection causes
What Causes Ear Infections in Dogs? The structure of the canine ear canal, which is more vertical than that of humans and has an L shape, that tends to hold in fluid. This makes dogs prone to ear problems. Some of the most common causes include: bacteria. yeast/fungus (aspergillosis) moisture (which can create a prime growing environment for bacteria and yeast) viruses. mites (more common in puppies than in adults) drug reactions.