It's a difficult one. I've lost a couple. I have family that went through it and had a really rough time.

It's part of the commitment you make when you take on a dog. A dog gives themselves to you wholly. Your commitment to them is to give them a good life, and to deal with the emotional burden when the time comes. Unless you're really old, you'll outlive your dog unless you're really unlucky. It's best case scenario with those amazing little beings. It still sucks, but we bear it because we love them.