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I am sorry to hear you are worried about your foster puppy. My name is Rebecca. I am a veterinarian and will do my best to help.
The first thing to do is have him checked for parasites, by taking a stool sample to a veterinarian and having it examined microscopically. Even if he has been "wormed", he could have parasites; not all parasites are worms and no one wormer will kill all worms and parasites. In a young puppy with bloody diarrhea, I would check for Coccidia, a one celled parasite. If he has Coccidia, he needs a medication called Albon to treat the diarrhea and the parasite.
If a microscopic exam of the stool has not been done, that is the first thing to do. If he did have this done, then I would treat him with medication such as metronidazole for the diarrhea.
Let me know how he is doing, and if I can answer anything else. Rebecca
How is your foster puppy? Can I help with or answer anything else?