Cindy...as upset as you are - you MUST treat your home for Gizmo - I know your mind is on Madda - but when you get ready....here's a good site with info on treating the house.
http://www.dogpro.org/index.php?pageID=49- and ask your vet about ParvoGuard -
I just wish I had better words for you honey ...I can't imagine how you must be feeling - I'm so sorry.