First of all I am so sorry for your friend and their loss. As for your question, the answer is yes, my family has had to have dogs euthanized in the past. Its not an easy decision to make, because you love the dog very much. But sometimes you have to ask yourself, are you really doing what is right for them by keeping them alive. Watching a dog suffer needlessly isn't easy to do, and sometimes this can be even more heartbreaking they allowing a Vet to put them down. We wish that we can do something to help them, but sometimes the only thing that we can do is let them go. Its a hard loss, but its one that many pet owners will ultimately face.