I have three dogs currently in a tiny Korean apartment. We have my two and then a foster who leaves on Thursday
(sorry a little excited that he has found a furever home)
It has been a challenge, walking, picking up the poop, and of course the fights.
I am not a fan of male dogs so we always have all females and I have never had a problem with dominance. My Jack is always alpha female so that is how we introduce them into the house.
Four yorkies does seem like a lot. How would you walk them? Travel? Are you prepared for the vet bills? I would go through a "what if" senario and see if you are financially and emotional ready to have a bigger pack.
BTW Kyle- I LOVE your avatar.