I believe what the OP is looking for is this song. I'm sorry I have no information on its origin or authorship; I learned it from a friend, Nick Browse (now of Boston), many years ago:

When men boast of their honor,
Of their faith and loyalty,
Let us think of Greyfriars Bobby,
Who could be as true as he?

Mid the rugged Scottish mountains
Lived a shepherd long ago
Tending sheep whate'er the weather
Whether wind, or rain, or snow.
He was tired, but never lonely
Though he roamed both far and wide,
For his doggie, faithful Bobby,
Never left the shepherd's side.

But the shepherd, growing older,
Suffered great infirmity;
All alone he fled to Edinborough,
There to die in poverty.
But the faithful Bobby followed,
Only instinct was his guide
Till he found his ailing master;
Then he never left his side.

When they buried Bobby's master,
Still he never left his side:
By the grave in Greyfriars churchyard
Bobby watched until he died.
And the Edinborough folk in wonder,
As such faith is rare to see,
Raised a statue in the city
To the doggie's memory.

So today man views his neighbor
With mistrust and hate and fear,
Cold suspicion, dark ambition
Seem to worsen every year.
Will that day be ever dawning
When all men shall brothers be?
Well, a humble Scottish doggie
Shows the way to you and me.

So when men boast of their honor,
Of their faith and loyalty,
Let us think of Greyfriars Bobby --
Who could be as true as he?