I'm like everyone else in that if I have a good dog, I don't want it to ever die, but when it does, I won't cry or get depressed. I won't feel much of anything since I knew it was coming. If the pet died suddenly by getting run over or something, that would be worse. I would be angry at everyone responsible for killing my dog. In my area, if you run over a dog as big as mine, you were negligent, reckless, and showing no regard for the wellbeing of others.
On another level, I realize that it's not all bad that our pets die. It's not what you want when it happens, but it gives us an opportunity to bring a new friend into our lives & variety is the spice of life.