I'm sorry you have lost your 'best friend'. I don't know if she died suddenly, but often a big dog will take a turn for the worse and go downhill pretty fast. If she was a small dog, 13 is not that old.
In any event, my heart goes out to you. Open your heart to the pain as you did to the LOVE. The Love will remain after the pain has burned away with time.
I rescued you when you were a senior, 12 years old. Over the last 5 years you've enriched my life with your unconditional love, your strength, your determination
Mom brought you home a 9 week old black pug pup born on the 17/09/2014. I fell in love with my new friend, even though you drove us crazy. I never knew