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Hello, my name is***** and I will do my best to help you. I am reviewing your question now and I will post back to you ASAP.
Let's see if we can figure this out.
First: what is his name and breed.
Does he eat dry dog food?
Can you send a photo of the "things" you saw
Did he have any dry food tonight? How long ago (Hours)
I am having a lot of trouble on this site. It keeps locking up on me. So I am going to opt out so that another expert can work with you.
In the meantime google "flour worm" and "insect pests of stored foods".
See if any of these are what you are seeing.
Hello and thank you for using this site to help you. I see the other expert was having trouble with the site. The picture looks like tape worm segments. Usually these can be seen around the anus as well. Tapeworm breaks off to look like small grains of rice which looks similar to your picture.
Because he visited a cabin in the woods it is possible he picked up a parasite from there.
I would drop off a stool sample to your Vet for testing and if you have what you took a picture of you can also show that to the vet.
Picture of tapeworm: You can see in the picture how the worm is long but them breaks off into smaller segments resembling a grain of rice which is what you might find in stool or vomit .
Here is more on intestinal parasites. https://www.vetinfo.com/whats-happening-if-your-dog-vomited-worms.html