My Belle, my hearts desire, passed on Sunday from what appeared to be Panleukopenia. She was the best tempered, sweetest cat I have ever had. She was ragdoll pure bred (absolutely gorgeous). I miss her terribly and hope to get another soon, but I am afraid to. How long after such an occurence do I need to wait to introduce another cat to the family? I have a dog too that misses her. I am going to a shelter and getting a "mutt" cat, older and very sturdy; not now, but later. How do I protect the new one? I do not want to do through that pain again. Would an older cat, fully vaccinated be able to stay free of such a virulent disease? Any qualified help would be greatly appreciated.