
Death is the normal finale to life, for our pets it is usually simply shorter.
We have to deal with and accept death. Have you had a lot of deaths to deal with in the family? Or conversely have you been shielded from human deaths and feel unable to deal with it? Worrying about death will just make life miserable, it is pointless, none of us knows the day or the hour, nor do our dogs even if we do, so they and we should follow their example, revel in each moment..
I have had all three, lost a dog young suddenly, had to make the decision for one at 13 1/2 (no agonising, I would not see her with a compromised quality of life), and one go in her sleep at just 11 very shortly after her mother.
The first was awful, a life cut off in it's prime, the second I was happy with, as she had a full life to the end with no suffering just slowing down, the third was peaceful, but I felt too soon, and I wasn't prepared.
Fortunately most of the human deaths of family and friends have been of those who had led full lives, sadly some died of painful conditions, but modern medicine at least allows for decent pain control. The ones who died suddenly were the lucky ones, the oens left behind find it harder.