From the states, its not a pet passport (pet passport is EU), but a bilingual health certificate that is needed. ISO compatibale microchip must be inserted BEFORE rabies shot is given. While Home again does make a ISO compatibile chip, not all EU scanners can read this chip. So make sure you are know what chip you want to use.
All info can be found here:
http://www.aphis.usda.gov/regulations/vs/iregs/animals/animal_italy.shtml
bilingual health certificate is a PDF from this site.