I'm glad Zoe's a mostly healthy girlie!

I keep a couple of break away collars and feliway on hand even though Diego is on the Prozac. If Cali gets to playing nicely he is determined to put a stop to it regardless of his meds. When an issue arises I spray both collars with feliway and apply one to each cat. That way Diego gets his own dose and if he continues to go after Cali he gets a dose from her too. Thusfar I've had no problems once I collar each cat.

I hope you can get peace in the household soon.