My guess is just probably normal build-up.
I would suggest avoid using water as the cleaning agent. I apply hydrogen peroxide to a cotton ball and gently wipe the insides of my puppy's ears once a week as part of our grooming session. She likes it, and lays down with her eyes partially closed.
Once a month, I use a stronger cleaner (Blue Power - just google for it) for her ears.
Hope I have helped some.
~ Rei
I would suggest avoid using water as the cleaning agent. I apply hydrogen peroxide to a cotton ball and gently wipe the insides of my puppy's ears once a week as part of our grooming session. She likes it, and lays down with her eyes partially closed.
Once a month, I use a stronger cleaner (Blue Power - just google for it) for her ears.
Hope I have helped some.
~ Rei