I have 70lb, 5yr golden retriever that has been recieving 1ml per 100/wt of 1% ivermectin in sterile solution on the first day of each month,for 4yrs. This is good for heartworms, but she now has mites. What kind you ask? Hard to say, but they leave lesions on her body, and they are starting to spread. I have read that ivermectin given once at a dose of 50times the dose I have been using,will correct the problem. As she currently recieves 70% of 1ML, this would require 35ML, which would be a lot orally. Can I apply it to the skin on her back and let it soak in? I would like a vet or someone who has done this, to tell me their outcome. Thank you. P.S. Inleiu of this treatment, what topical dip has been proven to work?