Many people say they can accept the death and accompanying sadness, but have great difficulty being the one who must decide when death will occur. I have found my feelings reflected by many who watch their companion animals struggle against a fatal condition. Let that thought remain uppermost in your mind as you face that decision, and again as you look back on the action you take. When a pet's life has to be ended, grief may be intensified. If you question the action you took, it is important to recall what led up to your decision.
Animals are survivors.
They will struggle to stay alive until they draw their last breath. A final act of caring is to see that your pet's life is ended gently. Your animal friend will then close it's eyes for the last time knowing that it's trust in you was well placed. You fought hard to stay alive, my friend. In the end, though, you couldn't conquer death.