I would say that by now you are seeing symptoms if there is a blockage. If he stops eating, drinking, or seems excessively bloated go to the doctor right away.

I have a hand held scanner that will pick up aluminum I bought from Harbor freight. At least i think it is aluminum. Small pieces of non magnetic flexible metals were found while searching the grass near my house.

One of those may show you if there is a large wad closer to the stomach than the exit door.

Prayers all will be ok.

My dog got a whole apple pie once.