As far as his choking, I talked to a friend after it happened and she said she had the same problem when feeding Strategy, the pellets tend to have dust. I switched to the sweet feed which helps him salavate more and he hasnt had any problems or anymore choking at all.
It's not dust, it's the break down of the product. We feed a pelleted feed. If we open a bag and there are 'fines' in the bag, it gets closed and goes back to the store.