It is so common for these "moth worms" to be found in petfood and other pantry items that you can buy special moth traps in the insecticide section of hardware stores. These worms are also found in people food, and often in organic food (since it is not sprayed with poison which would kill them as the food is stored). It is actually normal, and a good thing because it indicated less poison, however it is very common so don't think it's just purina.,, I would highly recommend feeding cats and dog grain-free food, because corn is not digestable and is used as a cheap filler in petfood. It can lead to stomach problems such as vomiting and bowel issues. Grain free is the way to go.