Light Karo syrup can help with blood sugar or energy. Also a product called Pet Nutri Drops (I always have on hand for new puppies).
*I'm concerned because the vet had no real findings...did/does the puppy have a "fever"?
Several things come to my mind when I hear of a 3 wk old puppy with some of these symptoms....(besides the dreaded Parvo Virus).
1) Coccidia ( usually treated with Albon antibiotic).
2) Giardia (usually treated with Flagyl)
3) Trichomonas (usually treated with Flagyl)
I would also consider a form of Respiratory infection, to be a possible culprit.
*No way of actually knowing without the Vet results*.
JMO...I'm not a vet...so I can only speculate.
Huerta Hof German Shepherds
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....where breeding is still considered an art....