I tried Spirit Essences many years ago for Kobi when he was bullying Callie. No help at all. I'd be inclined to try Feliway before SE. But even then I doubt you have success unless you start working with the cat to train him to go in the carrier. Lots of articles to read if you google "train cat carrier".
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...