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I have a GSD's. A 4 week old puppy should still be nursing. I would definitively get it to a Vet ASAP. I agree with all the above. 4 weeks is to young to be having these issue. Sorry your experiencing blood in the stool.Could be diet change on such a sensitive stomach? Or possibly Bever Fever "Giardiasis"? Parvo?
Definitely contact a Vet.
Parvo and coccidia are two things that come to mind. What are you feeding this puppy?