I'm sorry to hear about Nanook having a fall. He seems to be in very good spirits though. It different for everybody about the decision of when to let a beloved pet go, so I think you really will know. I'm so sorry that you are going through that though. When Yogi died last year we had her put to sleep when she honestly couldn't have made it through the night just to save her the suffering. She was in very poor health for about a week before that though but I couldn't let her go, I just couldn't, because she was still YOGI, you know? I still can't even think about it without crying, but I could tell she just wanted to have that time with us. A few days before she died I was thinking about having to put her to sleep, and I starting crying. Yogi was asleep in the basement, but in her terrible state she actually came upstairs to comfort ME. I still think about that and I know I was so lucky to have her as a friend and at least I know I saved her a little bit of suffering but I didn't let her go before she was ready. And I got to be with her when she left, which I'm grateful for. Anway, I don't mean to go on and on about it. I just want you to know I think you will know when Nanook is ready. And most importantly, you get to spend this time with him now.