You obviously now have two problems on your hands. First of all the cats were shaken up by the vet visit and this is causing a lot of aggression between the two. Second the female is having some behavioral issues that need to be resolved.



First off, keep the two separated for now. Since the female needs to relearn to use the box, keep her confined to a small room with just the litterbox, bedding and food. Hopefully she'll get the message soon and start using the box. Be sure to clean the area around the box with an enzyme cleaner like Nature's Miracle so that all traces of urine smell are gone.



Be sure you have separate litterboxes for the cats when you finally decide that the female can wander. Also introduce her gradually back to the male.



You might want to check into using a Feliway plug-in which can help calm the female.



Finally if all else fails ask your vet about consulting an animal behaviorist and/or prescribing an antianxiety medication like Buspar or Prozac. The decision to prescribe rests soley with your veterinarian who can monitor dosage and proper side effects.




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Smile, it will make them wonder what you are up to!

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