I have three bitches. All three of them are quite drivey, powerful and all three are dominant dogs. They weren't littermates but they compete with each other all the time.
In the house, no issues at all. However, I got them used to a nylon muzzle and that nylon muzzle is a god sent. It became a necessity with a Mal because she doesn't know how strong she is and because she doesn't regulate her playbites and loves to go for the other girls ears which too can lead to a fight. She only does it when she is overly excited and fired up. That's when she re-directs all her energy to the others and why she wears a muzzle whenever I let them out together.
I never, never, never ever have any toys involved. Toys lead to a definite fight between Nala and Indra.