Dough prepared to be fed to the dogs that guard the sheep is not kosher for the night of Passover, but if the shepherds eat from it, it is okay to fulfill one's obligation for the first night of Passover since it is kept from water. Thus regular flour is ok to make maza from it on the first night of Passover. [Rambam. Laws of Hametz and Maza 6 law 5]

my point is the dough is  meant for dogs.so even if the shepards eat from it, it was only guarded to not let water fall on it so that it could be given to dogs to eat. That is--so that it should not get moldy. But even regular flour falls into that category--that they owners are careful that water should not fall on it and let fungus grow in it.

My point here is that idea of Rav Nahman of Breslov that one should not search for extra restrictions-.The sources for this are the Le.M of Rav Nahman in vol ii chapter 4 and I think around chapter 86 and the famous hashmata [left out paragraph printed between vol i and vol ii] about the fact that if one wants to serve God, he must  think of himself as being alone in the world and not look at what other are doing.