Thanks so much for the answers to my questions.
First, I can reassure you that you don't have anything to worry about where the cats are concerned. They can't transmit parvo to dogs of any age.
And, since your Frenchie has been recently vaccinated, the likelihood of transmission from her/him to the pups is neglible.
The risk for pups at this age woudl more likely come from the outside environment, especially if parvo is prevalent where you live. This virus can be present just about everywhere but young pups are more readily exposed where an infected dog has been.
It is easily carried on shoes or clothing to new areas or into the home.
My suggestions to new owners is to severely limit contact of the new pup to other dogs except perhaps for family members or friend's dog whose vaccination status is known. Don't take them to dog parks, don't take them to pet stores, don't walk them on the street.
If you wanted to be really obsessive about it, you'd change your shoes when you enter your home although this may be taking things a bit far unless you spend a lot of time around other dogs (you work in a shelter, for example).
I don't consider certain breeds to be safe from this virus until they are at least 6-7 months of age but most pups will be adequately protected by 5 months. Even if they've been vaccinated several times, they may still be at risk since their immune status (or lack thereof) plays a huge role in determining whether or not a pup will succumb to the disease after exposure.
may be helpful if you want to read more about parvo virus but your I hope I've allayed any concern you might have about transmission from your pets to these new additions to your home. Deb