Prognosis for a Puppy with ParvoOur 12 week old toy Poodle was diagnosed with parvo 6 days ago. When we sent him to the vet, he was lethargic, had no appetite, and had watery poop, but with no blood. 6 days later, he is still very weak and has no appetite. Yesterday the vet said he vomited twice. But he no longer had blood on his poop though it is still watery.