You never know. I had 2 boys and hey just fought. They would play but everyday they fought for dominance. Depends on the personality. I now had on boy and 2 girls. The know the pecking order. 3 lb Winnie is the boss.. She rules everything. Whimzy 4 lbs is second but they play. Moki will give in. Until its dinner then they don't Mess with him. He will mow down both of them anytime he wants. A larger 7# Male. But he's nice but always hungry.. He would be 15lbs is I let him.. The girls stop eating when full. He will eat like theres never any food. So my point is all depends on THEIR personality. Can have all alpha types |