Biiiiig difference between play fighting & fighting. LOL I even consider myself experienced as far as pack leadership goes...I know how to handle a LOT of issues & situations. I can let my girls mingle if I'm RIGHT there they are fine. But still, at the drop of a dime with no signal lasting more than a split second there can be a full on bitch fight that gets NASTY. If both girls were spayed we more than likely wouldn't have an issue so yeah...spayed pet females should be relatively easy to manage w/o issue. You have play fighting but that's normal & acceptable behavior. I choose to have unspayed females at the moment. BUT...I know how to handle it & we've been w/o an issue for months & months.Yeah my litter mates fight a LOT... but it's always playing..