babybleu— Where your labs diagnosed by a vet with a skin scraping for sarcoptic mange?
You do not need to use ivermectin for localized mange. IMO, it is an unneccesary use of pesticides on dogs and the mange would probably go away even if you did nothing.
You can start by trying a home cooked or raw food diet, start them on immune building supplements (ie, Vitamin C 2000mg, Vitamin E 400IU, Salmon Oil, and Probiotics) and apply Neem oil or Neem Shampoo (ie,
TheraNeem Pet Shampoo—Link) and it should go away quickly.
I have heard that Defendex is good for sarcoptic mange mites also known as scabies
VETiONX® Defendex? - Fleas, Ticks, Mange and Scabies Treatment Shampoo—Link
Some dogs have the mutant MDR1 gene and cannot use Ivermectin, if unsure, please check with your vet.