I have a 20 year old female cat, who had a stroke a year ago, but she was nursed back to health. We had to buy a large dog cage furnished with bed and potty, because she can't control her urinating. Poor baby can't hear, walks with a limp, and must be bathed frequently (urine). I don't think the brain is functioning as well as it should either. Yet, she eats and functions. We've had her so long, it's hard to see her failing. Is this any kind of a life for her? When do you know it's time?