This is probaly the wrong place to ask advice, but here goes. My sister has a 15 year old cat that is on his last legs. He has hyperthyroidism and a possible growth on his intestines. The doctor says he thinks he can save him but it's gonna cost. I told her that the cat is 15, that's like 76 in human years. I hate to see him die but how much longer does he have. Has anyone else had to make a call like this?