just want to state DO NOT MIX KETACONAZOLE AND IVERMECTIN it will cause ivermectin toxicity as you are dealing with a mite and a fungal infection so please make sure your vet does NOT do this as my friend's derm did this and gave her dog these two drugs and the dog went into a coma and almost died
I would use revolution as my first choice before using ivermectin just in case your vet is mentioning this
scabies (sarcoptic mange) is contagious and it can pass to humans so your dog could have got this from another dog.
this company makes a good shampoo as well and more info for you
Pets'BestRx™ Mange Breakthrough Solution :: New Developments on Mange Treatments from Pets'BestRx™
more info
http://www.petplace.com/dogs/sarcopt...ogs/page1.aspx
diet will not help with this - diet only helps with demodex mites as it is immune related and some feel raw feeding or home cooked are better for demodex mites as well as for allergy dogs as they are tied so immune system to immune boosting helps. Scabies is a mite that is not tied to immune system just passed on from other dogs as highly contagious
if fungal infection raw coconut oil helps