Is your breeder aware you currently have a male dog? Has she/he discussed male/male aggression in the breed? This is a very big issue in our breed and not one to be taken lightly. If it occurs, it isn't something that can be "trained out."
I hope this doesn't sound harsh and I say this in hopes of providing information not bashing. Is this a responsible breeder - health testing pedigree, showing/working her dogs, temperament testing. Or is it someone just breding 2 dogs together because she owns them? If it is the latter, I'd skip this litter and do a bit more research. Has she provided you with pedigrees and 3 generations of health testing (hips, thyroid, CERF, cardiac testing). Has she gone through the longevity of the pedigrees? What have the other dogs dies of? Any wobbler, cancer, liver issues? What was her goal in bringing these 2 dogs together? Pros/cons of dam and sire?