While some may have dominance issues with dogs of the same sex, most get along well with other dogs and pets. (puppy-training-solutions.com)
Beyond that, if you suspect you're still having an estrogen dominance issue work with someone who can do some thorough thyroid and estrogen testing to see where you're really at. (betterbydrbrooke.com)
I have heard that having a female and male is easier, because dominance issues are a lot less. (michael--korsoutlet.ca)