[targonrotts]

clean well wherever the parvo pup was. water/bleach mix and wash in hot water or throw out blankets/bedding it used.
i would not worry as much for the 1.5 year old, but more for the 6 months old.
if the 6 mos old had shots recently and had at least 2 parvo boosters before, it is probably allright. you can ask your vet to run titers on both your dogs for parvo.
if any signs of lethargy,vomiting,diarrhea, see your vet asap.
hopefully all will be ok.