maza shumra is a sort of concept that got taken out of context. The idea comes from the Gemara that dough that is made for dogs is Ok for Passover even to fulfill the obligation of eating maza the first night of Passover if the shepherds eat also from it . that is called "shumra" {guarded}.
You can not imagine they guarded the dough so that the dogs could fulfill the mitzvah!
This all comes down to an important idea of Rav Nahman: not to add extra restrictions.
[I thought to add here that all the restrictions about maza are sometimes exaggerated. All maza is is flour and water baked or fried before 18 minutes is up from the time the flour touched the water and put into a frying pan with oil at the bottom so it doesn't stick. [not any more oil than that.] The thing is that you have to remember is the it should be בלילה עבה thick dough, not easily poured like you would be making a pancake. Of course the pancake is also ok in terms except that to be "bread" (Hamotzie) the dough has to be thick. A think dough is "mezonot".
