That's always hard.I hate to lose one. No matter the reason I blame myself. I could never be a vet because of that.
I volunteered at the local shelter for many years and filled in as Acting Director when we were between Directors (I was a Board member and on the Executive Committee.) I've made lots of difficult euthanasia decisions, and while it's never easy some are harder than others. Unfortunately there's just not enough space, or homes, for all the animals that come in the door. I also went through the training and have euthanized a number of animals. I felt strongly that I could not ask the staff members to perform this duty if I was not willing to do it myself. (By the way, I'm the only board member that ever went through this training.) I can tell you it is a VERY difficult and depressing task. The people that have to carry out this duty deeply love the animals in their care and do all they can for them.
George