My bitches are all good mothers, so I haven't had this situation. At nearly three weeks, they are not ready to be weaned yet, but, they not only have 50% of her genes, but she is imprinting them as well.
I think I would take them away from the dam and raise them by hand at this point. Two week old puppies can walk, they shouldn't be carried by the dam unless the house is burning down at 19 days.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.