My pet is 1.5 years old, and I've been diligent about cleaning his ears daily. Recently, I noticed a brown discharge in his left ear. Upon closer inspection, the ear appears to be clean, but when I wiped it with a white cloth, I observed a dark-colored discharge. Can someone please help me understand what might be happening with my pet? Thank you in advance.
Rio, Dog, Shih Tzu, Male, Neutured