
The dam gets wormed at the same time as the pups, she should have been wormed daily from day 40 to 2 days post whelping to get a hold on the worms before she starts to feed the pups.
I use Panicur 10% liquid as in my breed I only need to give a very small amount and this is easily calculated for the pups.
Make sure any other dogs in the home are up to date on worming too.