What kind of cleaning products do you use. They usually do get a staph infection when they are going thru their puberty phase. But the ones that have severe allergies it can be caused from anything. She may just have a simple food allergy. It would take changing her food and you would not see a difference for about a month. But I would try switching her to one of the sensitive skin sensitive stomachs, it is based on salmon and many brands have it, proplan, purina one has one now, science diet, natures recipe, etc. Also we have dog that is highly allergic to cleaning products,lysol, febreeze, etc. We are only able to clean in bleach or vinager. To clear her up you need to find the route cause, and sometimes trial and era is all you have. Hope this helps.

How many times do you take your Neapolitan Mastiff for a bath a week. I suggest a minimum of 2 times a week is good enough for this is a standard of a good Neapolitan Mastiff care.