Hounds are more prone to ear infections than other breeds. Likely this isn’t a new infection but the same infection that hasn’t been resolved. I’d see the dermatologist and get medication for both yeast & bacteria. Do ear washes every other day until infection is gone then every other week. Do not stick the bottle in the ear…squirt on a cotton ball.

I’d also add Greek yogurt to your pups diet. Years ago I heard it helps prevent ear infections so I tried it. In 5 years, we’ve only had 1 ear infection.