Looks like my wife and I are going to go through this today. Our dog has taken a very hard turn for the worse. Max has had a good life but is approaching 14 and can't even get up to go outside anymore. One day he's walking and fine and then next day I watched him try to get up, fall over and now he can't even get up at all. We knew it was coming, sooner, rather than later, but it's still extremely hard.
Our cat, who usually is quite noisy and causes hell, knows something is up. He has been very quiet and just laying quietly, not bothering Max at all, like he usually would.
This is going to be a really, really crappy day...
