When they pull kick them and say no (or something like that, like the dog whisperer would do).! (you dont have hands free i assume). I dont mean any violent bone braking force, but this is the only way to control 2 big dogs on the same time. If i'm wrong i stand corrected.

edit: If they cry you kick to hard.
My grandma in denmark allways had 2 big male rotweilers and this was how she learned them to noget pull. The earlier they learn the better.

Dogs need a strong but loving leader, enough with all that soft stuff. You can be a good mama anyway.