We have purchased a puppy (8 wk old black male lab X) from a pet rescue site and become quite attached though are yet to pick him up, and he has come down with Parvo. He is apparently doing really well, what are his chances of living into a healthy, robust adulthood? We want to save him only I am a little concerned he might be sickly for his whole life. Will he be contagious for long? Does anyone have advice?