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Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
I am so sorry to hear about sweet Tigger's condition....this poor gal has been through so much and it is no surprise that she is anxious and afraid. It is good that you are using Feliway but it appears that medication is now the only thing that will get hr past this.
Fluoxetine or Clomipromine will decrease the anxiety that Tigger is experiencing and help stop this inappropriate elimination. Place aluminum foil in the areas where Tigger uses to discourage this. It seems that there is no way for you to control the actions of the other cat but you can ask your vet for this medication to help poor Tigger past this.
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