My dog is a 60 lbs mutt with floppy ears. He has had an ear infection for two years.
Treated for yeast, I have been rinsing out with borasitic acid and swabbing out pretty regularly. Then applying an ear lotion. He is still so bothered by itchy ears and sensitive on the inside. Anything else I can do. I'm going thru a tube of lotion a month.
At this point surgery may be an option. You should talk to your vet about surgical procedures that open up the canal ( lateral ear resection). vetcare