Talk to your vet they can give them stuff to help it dry up but I think you should just leave it to dry up it self but don't squeeze them it will take about 2 weeks to dry up.
What Can I Give My Dog To Dry Up Her Milk?
Nothing, it dries up itself.
1 tablespoon of parsley added to her food ...submitted by a breeder on another site...I am going to try this...and possibly a shot from the vet....