We need to first understand what causes ear infections in dogs to get to the root of the problem. Bacteria and yeast are the two most common culprits along with a host of other factors such as waterlogging in the ear canal, untrimmed ear hair, foreign objects being inserted into the ear canal and ear wax, to name a few. If your dogs outer ear is not erect, its chances of contracting a fungal infection in the ears increase. As opposed to a normal human ear canal that is horizontal, the ear ...