My dogs and cats have been to veterinarians,but it did not help them with this problem. So I tried my own mixture on them and it worked.
1. Dilute three drops Yellow-Dock tincture
2. Dilute three drops Golden-Seal tincture
3 1 1/2 Tbsp distilled or filtered water
First shampoo pet’s head,tail,ears make sure these are clean.
Use a dropper and a half droppers in each ear, let the pet shake
their head, than blot with a cotton ball, use every three days for a month.