Henry, is sounds like he's gotten into something that has caused intestinal distress. With luck it's just an irritation. How frequent is the diarrhea? If he's not drinking, diarrhea can result in dangerous dehydration, so you'll want to try to get him to take water when he's awake. Ice chips sometimes appeal to dogs who aren't interested in drinking.
I'd not feed him tomorrow. After 24 hours, you can try to feed him bland food--boiled chicken (no bones) or boiled hamburger and rice or noodles, then after a day or so, switch him slowly back to his usual food.
If he doesn't improve tomorrow, he'll need to see a vet on Monday.
If he begins to vomit or shows worsening symptoms tomorrow, get him to an e-vet asap.
Good luck with your dog.
Also, if you want more people to see your question, post a new thread in the health forum with a descriptive title. This thread is so old that many people won't see your question here!
Welcome to the board, Henry.