my cat died a little over a year and a half ago... when I went to bed, she was fine; when I woke up, she was dead. it broke my heart, as I'd had her ever since she was a 3-month old baby. she slept in bed with me most nights (not that one, though) and was absurdly attached to me/terrified of anyone else.
I didn't get another pet until three weeks ago, when I adopted two little bunnies... longest stretch of my entire life that I've gone without having at least one pet. about a week after I brought them home, I found my little holland lop playing dead and it scared the heck out of me! I couldn't have been more relieved when I touched the side of the cage and she jumped up.