Ear infections in dogs are caused by the following:

• Allergic dermatitis (skin disease) is the most common trigger
• Ear mites
• Excess moisture getting into the ear
• Foreign material getting stuck in the ear (eg grass awns)

The initial inflammation is exacerbated by secondary infection with bacteria or fungi/yeast.

When we suspect an ear infection, we take a swab from the ears and look at this under a microscope to determine what is causing the problem, and how best to treat it. After treating the ear complaint, it is generally recommended that we see them back at the end of the course to ensure any residual infection is cleared, and decide if we need any further action.