system
sad: My 13 year old dog had to be put down.
human
Hey, I'm not doing to good, I had to put down my 13 year old dog
gpt
That is so depressing. They say dogs are man's best friend. 
human
He was definitely mine, it's going to take a bit to get over him
gpt
I am sure, grieving can always take time. It is so hard to lose such a faithful companion.