One of my dogs died yesterday. Woke up and she was lying in blood that she vomited.. She couldn't do anything anymore, so she had to be put down. (Not neglected, she recently has been put on medicine the vet gave her)
I wasn't around for the dog's whole life but it lived 8 years. :x
Not sure how I feel about it, while I do feel bad, I am kind of glad that she will no longer suffer (she has congestive heart failure, is deaf, and partly blind), she will no longer keep everyone up until 4am, or use the floor as the bathroom.
It's very sad, but I think you did the right thing.
I wouldn't want any family member, human or otherwise to go about lingering in miserable existence until they simply dwindle out of life.