Hi all...I’m at the end of my rope here. I’ve posted before about this, but I’ll briefly refresh. I have 5 cats, all neutered, all under 5 years. One male, four females. Three are attacking two since July. I’ve tried: CBD oil, calming collars, Feliway, Rescue Remedy, Prozac, re-introduction, advice from several cat behaviorists. My house is divided in half right now and my nerves are shot. I have the correct amount of litter boxes and cat trees. And window shelves. They just hate each other. It appears that the first three have formed a “pack,” and will not accept the latter two whom are younger. Did anyone ever hear of vibration collars? (Not shock, NEVER!) I’m wondering if they make a mild vibration collar activated by a remote. I’m thinking it may work with one bully at a time. The fights are nasty. Fur flying, skin broken. Not a happy household. The stress is unbearable. Any help would be much appreciated.