Sarcoptic Mange

Sarcoptic Mange is another kind of mite that causes hair loss and irritation. Sarcoptic Mange is highly contagious to other animals and can also be transmitted to humans, although this is rare. These mites will dig tunnels down into the skin and cause itching, inflammation and hair loss. The dog usually has large patches of hair loss and crusty scabs where the hair loss has occurred.
It is harder to see the Sarcoptic mange mite from doing a skin scrapping. The mites move fast and sometimes you can do tons of scrapings and still not see anything. One common test that can be done is called the Pedal-Pinna Reflex Test. Most every dog that has mange with have mites on the Pinna which is also known as the ear flap. If you take the ear flap of the dog and gentle rub or scratch the underside of it a dog with mites will reflexively do a scratching motion with their back legs while you are doing this.
Ivermectin is an active ingredient in Heartguard and it has now been found to kill Sarcoptic mange mites if given in the correct dosage.
Some breeds can not take the drug Invermectin as they have a sensitivity to it and it can be fatal. Collie breeds and other similar breeds should never be given this medicine. Ask your vet.
Revolution is what I used when I had an Australian Shepherd and it worked great. It also protects again fleas, ticks, heart worms etc. I swear by this stuff!