It's not your fault or anyone else's. It was time. I was extremely lucky for all the time I got with my dog. He nearly made it to 19, he was about five months past 18. He was incredibly healthy for his age, but once it became clear he was in pain and his appetite gave out (that happened several days ago), we knew it was time to say goodbye. His breathing became labored and short throughout the day and we decided we needed to let him go peacefully rather than try to force him to live longer and reduce his quality-of-life. We had a peaceful goodbye with him our laps, petting him and loving on him as he went.
One can understand the reality of life all they want, it doesn't stop the hurting.
Yes, every four years. I knew it because the birthday feature in a number of places glitched out all day, like a compass that's right on top of one of the poles.
I lead a large group of people and sometimes have to pretend to care about one ignoramus’s concerns. That was my leap day. She’s young and inexperienced and is not capable of accepting reality.