I think that Kipling (as so often) said it best
There is sorrow enough in the natural way
From men and women to fill our day;
But when we are certain of sorrow in store,
Why do we always arrange for more?
Brothers and sisters, I bid you beware
Of giving your hearts to a dog to tear.
Buy a pup and your money will buy
Love unflinching that cannot lie -
Perfect passion and worship fed
By a kick in the ribs or a pat on the head.
Nevertheless it is hardly fair
To risk you heart for a dog to tear.
When the fourteen years that nature permits,
Are closing in asthma, or tumor, or fits,
And the Vet's unspoken prescription runs
to lethal chambers or loaded guns,
Then you will find - it's your own affair
But - you've given your heart to a dog to tear.
We've sorrow enough in the natural way
When it comes to burying Christian clay.
Our loves are not given, but only lent
At compound interest of cent per cent,
For when debts are payable, right or wrong,
A short time loan is as bad as a long -
So why in Heaven (before we are there)
Should we give our hearts to a dog to tear?
When the body that lived at your single will,
When the whimper of welcome is stilled
(HOW STILL!)
When the spirit that answered your every mood
Is gone - wherever it goes - for good,
You soon discover how much you care,
And give your heart to a NEW dog to tear.
RUDYARD KIPLING