i'd tell the vet the truth. That you just had a dog pass away due to parvo and that the puppies were exposed to the area before they completed their series of vaccines.

It is very sad to say & I really hope they don't but there is a very very good chance that the puppies have parvo too.

Since your vet is mobiling out to you I strongly suggest that you warn him of the parvo at your house BEFORE he comes.

Good luck with your vet.