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It looks like your previous expert has gone offline, and I didn't want your questions to go unanswered.
In treatment of rodenticide toxicity, often activated charcoal is given to the dog if it's within an hour or two of ingestion, when some of the toxin is still in the stomach. Since it's been so many hours since your dog ingested the poison, giving him the activated charcoal would be a moot point.
The Vitamin K therapy is a good idea. Rodenticides interfere with the clotting cascade (meaning the dog can't form clots and can bleed to death) by using up all the Vitamin K in the body. We use supplementation vitamin K to help the clotting cascade work properly.
Because I'm not exactly sure what kind of poison the dog ate, I'm going to give you a link to a page that lists treatment options for all types of rat poisons:
I understand that you may not have access to a vet, but if you do, I strongly urge you to have him seen...
I hope he does okay.