
We had the same thing with a pregnant bitch. Our vet said she couldn't be given antibiotics so he prescribed eardrops called
Otoclean. They are a cleaner, they come in little bottles and we had to put one in each day for, I think, a week. We were told they were safe in pregnancy. When we took her back, her ears were fine, nice and clean with no visible infection.
Seems to me that ear infections are not unusual in pregnant bitches. We've had two now with different bitches, and it's not an uncommon question on here. Not sure why though. Good luck with your girl brownie.