Vanilla, use vanilla. He acts "badly" because she doesn't smell "right". When you bring her home from the vet, or back in from outside, before they see/smell each other, take a cotton ball with a little vanilla extract on it and smudge on top of both their noses. That way they both smell alike.


Non-Recognition Aggression

This explosive type of aggression occurs between feline housemates that have previously had a reasonable relationship. It probably occurs through "failure of recognition." Non-recognition is most often triggered when one cat in the family is brought back from the veterinarian's office, or the groomer, and smells and behaves differently. If a fight ensues, it can damage irreparably the relationship between the cats and lead to the development of territorial aggression. It is best avoided by separating indoor cats after outside excursions until it can be established that they are friendly toward each other.