I would always inject bitch about 2weeks before she due for parvo,keeps the pups safe until there 8weeks old then do the pups,also do the bitch for worms,in saying that i have'nt bred a litter of pups in about 10year,last litter was labs.
was 2 pups id bought in, will do that next year for my collie litter i have planned, good idea jabbing the bitch week 7, thankyou