Hi I have a question. I have a 12 year old cat named Alison. She has gone from Ms. Grouch into not so much Ms. Grouch and more into Ms. lovey dovey. But I do have one question. When I pet Alison I am starting to feel her back bones and her pelvis bones on top, other than that she is normal. Is this something that I should worry about or is it just a normal aging thing?