Princess never gets tangles but she was very yeasty. I read this article posted here on YT (link below) & I stopped all 'sugary' foods, no more store bought treats (since most has sugar/ molasses of some kind & potatoes in it). Picked out a kibble w/no potatoes & Princess has been yeast free. She used to have brown gunky ears that I had to clean out every other day & she had a cytology done on the scrapings & it was confirmed to be yeast. She used to scratch her ears to the point where it would bleed.
Now her ears are itchy free & no more brown gunk, we're both very happy.
Eating These Foods Can Cause Dog Yeast Infection