Your need to prevent the fighting from occurring in the first place. Female fight for a different reason then males. The issue will continue to escalate between the females since the goal is elimination of the other female. I would not leave them home alone uncrated ever! You could come home to a disaster. There have been other member here that had to rehome a female because of this type of behavior as is escalated to the point of endangering the lives of the 2 females. You cannot shake a can or make a noise to stop the fight. They need to be seperated but better to work on prevention instead. There has to be clues and signals that you are missing prior to the fight~a glare, growl, shove they are not just going at it out of nowhere. Do you and your sister live together? Are the 2 spayed? If you live in different homes are the fights occurring at a your home or your sisters?
__________________ “Never argue with a fool, onlookers may not be able to tell the difference.”  Mark Twain |