From Tony Pastor's Book of Six Hundred Comic Songs and Speeches, by Tony Pastor (New York: Dick & Fitzgerald, 1918), page 66:

THE SCHOOL OF JOLLY DOGS.
As sung by Tony Pastor.
Written by Harry Copeland.

There is a school of jolly dogs,
I've lately come across;
They're game for any mortal thing.
From this [sparring] to pitch and toss:

CHORUS. And they always seem so jolly oh!
So jolly oh! so jolly oh!
They always seem so jolly oh!
Wherever they may be.
They dance, they sing, they laugh ha, ha,
They laugh ha, ha, they dance, they sing.
What jolly dogs are we!
Fal lal la, fal lal la, fal lal la,
Fal lal la, fal lal la, fal lal la,
Fal de the ral, de the ral lal li do.
Slap, bang, here we are again,
Here we are again, here we are again—
Slap, bang, here we are again,
What jolly dogs are we!