Just so you know many cats will actually be positive for hemo and test negative, it's tricky to test for, so many vets will give them the med for it anyway, it can't hurt and may save his life. I think the doxocycline (sp?) is what's used for it.
How many positive cats has your vet worked with? If he isn't very familar with them and how quickly they can crash he may not be as concerned about the PVC as those of us who deal with this on a daily basis.
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