I would get Warlock to the vet ASAP for a parvo test. Even if he seems okay now, he could still be in the incubation period.

Ok, I just read what you wrote about him having it? Did you treat him at the vet? I've never heard of a parvo puppy getting better without treatment. Even WITH the treatment, its really touch and go.

I always keep my foster puppies away from other dogs and areas where other dogs have been.

I am very sorry for your loss. I know how hard it is