Hello. I have a cat that is 11 years old next month, and I have realized that yesterday and today she has not eaten any of her canned food that I feed to her every morning. She has had the same type since she was a kitten, and I do not know whats wrong. She has also been acting very perky, and whenever I start to pet her, about a minute after, she will be purring, and then in another minute she will try to bite me and attack me. She is normally a very calm cat who loves to be petted, and it is very unlike her. I do not live in the city, I live with woods around me, and she is an out door cat. I have scheduled an appt. with the vet, but not until next week, and I am very worried about her. I have tried feeding her ham, and she has eaten it, I do not know if she does not like her food anymore, or what, but I am very worried. Does anyone have any advice?