I've got a 13 month old male silver, Bailey. I got him from one of the top breeders in the states (Emau) and the breeder was more than willing to share health issues with me.
First off, depending on the line of Mau you get, you will possibly encounter certain health issues. Traditionals will probably have the asthma and cardiomyopathy more than Indian lines (my boy is Indian line). Indian line Maus are basically cats that can trace their lineage back to an Indian import. The Indian import cats brought in much needed new blood and effectively bred out a lot of health problems.
Some Maus have an allergy to caramel color, which could be the main reason for hot spots and scratching. To avoid this, I simply avoid any food with caramel food coloring in it.
Like many Maus, my boy is food obsessed! Maus can easily get overweight, so you have to be stern when they ask in their sweet little voices. . . I know I can be a real sucker!