My kitten Sierra was taken to the vet on 3/20/08, and I was told that she had FIP. I've done my research and talked to the vet and assistance, but at 3pm today,& at 8pm, she got up to walk and her back legs were not working properly. does this mean that she is worse then what I am thinking, and should I be prepared to put her down? I have given the antibiotic, supplement, sugar water, and the soft kitten food the way I was told, and she has really been eating well. I am just really worried now with this new problem..Thank You... "Sierra's Mom"