I think this is fitting for this thread:
THE PURPOSE OF A DOG - FROM A 4 YEAR OLD
Being a veterinarian, I had been called to examine a ten-year old
Irish Wolfhound named Belker. The dog's owners, Ron, his wife,
Lisa, and their little boy, Shane, were all very attached to Belker
and hey were hoping for a miracle.
I examined Belker and found he was dying of cancer. I told the
family we couldn't do anything for Belker, and offered to perform
the euthanasia procedure for the old dog in their home.
As we made arrangements, Ron and Lisa told me they thought it would
be good for the four-year old Shane to observe the procedure. They
felt as though Shane might learn something from the experience.
The next day, I felt the familiar catch in my throat as Belker's
family surrounded him. Shane seemed so calm, petting the old dog
for the last time, that I wondered if he understood what was going
on. Within a few minutes, Belker slipped peacefully away. The
little boy seemed to accept Belker's transition without any
difficulty or confusion. We sat together for a while after Belker's
death, wondering aloud about the sad fact that animal lives are
shorter than human lives.
Shane, who had been listening quietly, piped up, "I know why."
Startled, we all turned to him. What came out of his mouth next
stunned me. I'd never heard a more comforting explanation.
He said, "People are born so that they can learn how to live a good
life --- like loving everybody all the time and being nice, right?"
The four- year-old continued, "Well, dogs already know how to do
that, so they don't have to stay as long."