This sort of "scientific" study gets touted all the time on slow news days by lazy or ignorant reporters. There are bacteria in everything. Lots. You really don't want to know what's in your hamburger. We, or dogs, get sick when the number or harmful bacteria exceeds the capacity of our immune systems to fight them, hopefully temporarily so we get better. In part our immune systems get stronger as we are exposed to more bacteria, so living in a plastic bubble is probably a bad idea.
That said, there are some pet food manufactures (also hamburger manufacturers) that use extremely low-quality ingredients. It's important to know the source of the food you get.
Of course it's a dried penis. Why would you feed your dog something when you don't even know what it is? What a horrible thing to do. My dog doesn't eat anything I won't. (Although she likes some things that I think taste really nasty and would only try again if I was starving.)
