Does anyone know what vaccinations you really need to have for indoor cats? I had been getting every vaccination there is, but I've been hearing lately that not only are they all not necessary, but some are actually harmful! Someone told me that the leukemia vaccine can cause cancerous tumors! Does anyone know how I can find out about this? You know the vets always want you to get every shot. My two cats have never been outside and not only are these shots very expensive, but I don't want to expose them to something harmful that they don't really need. Any advice would help. Thanks.