Yes , yes , yes , everything Misfits4me says.
If you can't get in touch with the animal rescue organization , leave them a message and take puppy to a vet ASAP.
Call your animal rescue & tell them you need to get your puppy a Vet appointment immediately! This sounds like Parvo to me & the smell would confirm it!!! Three days is too long & Parvo is fatal!
Dehydration alone, can kill a puppy.....Please, make the call now & get going...Please, let us know what happens...I hope it works out for you both! Karla
You really need to get the puppy to the Vet and soon as they can go downhill quickly. Could be Parvo, parasites, etc.