What is the brown stuff in my dog's ears and how can I safely clean it out?

The brown stuff in your dog's ears is likely ear wax or an ear infection. To safely clean it out, use a veterinarian-approved ear cleaning solution and gently wipe the ear with a cotton ball or pad. Avoid using Q-tips or inserting anything deep into the ear canal to prevent injury. If the issue persists or worsens, consult a veterinarian for proper diagnosis and treatment.