I wish I knew the author, but I don't. I wanted to change the gender for Bourbon, but I don't want to tamper with the original poem, so we'll just have to do it mentally.

Dog on Loan

I'll lend you for a little time,
A dog of mine God said.
For you to love while she lives,
And mourn when she is dead.
The years they may be six or ten,
Or even a few as three.
But will you, 'till I call her back,
Take care of her for me?

She'll bring her charms to gladden you,
And shall her stay be brief,
You'll have her lovely memories,
As solace for your grief.
I cannot promise she will stay,
Since all from Earth return.
But there are lessons taught down there,
I want this dog to learn.

I've looked the wide world over,
In my search for Master true.
And from the throngs that crowd life's lanes, I have selected you.
Now will you give her your love?
Nor think the labor vain.
Nor hate me when I come to call,
To take her back again?

We answered in sincerity,
Dear Lord, Thy will be done.
For all the joy this dog shall bring,
The risk of grief we'll run.
We'll shelter her with tenderness,
And love her while we may,
And for the happiness we'll know,
Will ever grateful stay.
But shall the angels call for her,
Much sooner than we planned,
Well know the bitter grief that comes,
And try to understand.