So close to tears! I split with my partner of 3 years on the weekend and we had 2 dogs. One is mine and one is his so in a way I lost one of my dogs.
I understand the struggle about an older dog. My dalmatian is 13, I got her when I was 10 and she was my childhood best friend, I wasnt a very cool kid so I would spend my days exploring the yard with my dog. She is still with us but she is slow and takes a long time to get up and an even longer time to lie down. She can still see, hear etc just fine and is still very happy but I know she will go downhill quickly soon and that she wont be around much longer. Best of luck with your decision and recovery. You can only take it one day at a time.