Why does my dog's ear have brown stuff in it and how can I safely clean it out?

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