It just sucks though as he only had arthritis in his hind leg but went down hill rapidly over last two weeks. Of course he had other issues like chronic sinusitis that required two different drugs plus hyperthyroid which is pretty common in older cats. He was chasing chipmunks couple weeks ago and we think he further injured himself. He was dragging his leg around for the last week. Tried some other drugs for the pain but didn't seem to have any effect. The sister from the same litter we still have and is also 17 is still doing well. We also have one other around 10yo, but neither have the loving personality that Kevin had .