Mmmm. Mitaban is an incredibly harsh way to treat mange - and really should only be used as an absolute last resort for generalised mange, never ever for localised mange (ie. 90% of cases). A lot of vets refuse to use it, and it has been withdrawn from the market before - thing is, it poisons the dog, not just the mites and it's a case of seeing which one succumbs first.
Demodectic mange is an
immune system problem. ALL dogs have demodectic mites, all of the time. They normally live in harmony with the dog - but in some cases, when the immune system is compromised/suppressed/defective, then the mites can multiply out of control - and you've got mange. This is one reason it commonly affects puppies - their immune systems are only just developing.
In 90% of cases, the dog will actually self-cure. That is, the immune system will develop and the mange be brought under control naturally. It is only 10% of dogs who have truely defective/compromised immune systems and can go one to develop generalised mange. Even then, 30% of those dogs will self-cure. It really is only a small percentage who cannot overcome the condition themselves are require aggressive treatment such as mitaban dips. The problem though, is that it's a case of seeing who succumbs to the poison first - the dog or the mites.
Your dog has only localised mange - a couple of spots. There is no way in the world that I'd be giving her mitaban for that. Seriously, dogs have been killed by that stuff - and there are far gentler ways to deal with it. Because demodex is an immune system problem, the key to treating it is boosting the dog's immune system as far as possible. That's the other problem with mitaban - it's poison, so even if your dog outlasts the mites, you've hammered it's immune system so much that it is vulnerable to recurrances.
Better treatments, in order of preference and escalation are:
(1) Boosting the immune system as far as possible and just letting the dog recover on it's own. That is done through high quality diet and supplements, and eliminating any stresses - such as vaccinations or surgeries. Goodwinol ointment can also be helpful, applied topically to the mange spots.
(2) Oral Ivermectin. Far, far less toxic than mitaban and with a very good success rate. Use in combination with boosting the immune system as above.
(3) The absolute last resort - and ONLY for generalised mange cases (ie. in desperation): mitaban.
There are hundreds of threads about demodectic mange on these forums that you'd find with a search. There are a great many threads on the dangers of mitaban too. Do make use of the search feature here - there's some very good information and others' experiences to be had. Here are a couple of threads - there are many, many more:
http://www.boxerworld.com/forums/showthread.php?t=77753
http://www.boxerworld.com/forums/showthread.php?t=78074
http://www.boxerworld.com/forums/showthread.php?t=79756
http://www.boxerworld.com/forums/showthread.php?t=79261
http://www.boxerworld.com/forums/showthread.php?t=70586
http://www.boxerworld.com/forums/showthread.php?t=66582