Rob,
Here are the chords I use. It's a bit different than the concertina version given above.
[C]Now I came home the other night, drunk as I could be; [F]Found a horse [C]in the stable where [G]my horse ought to [C]be.
Oh, come my wife, my pretty little wife, explain this thing to me How come that [F]horse in the [C]stable where [G]my horse ought to [C]be.
You [F]blind fool, you [C]drunken fool, [G]can't you never [C]see? [F]That's only a [C]milk cow my [G]granny sent to [C]me.
I've traveled this wide world over, a [F]hundred miles or [C]more, But a [F]saddle on a [C]milk cow I [G]never did see be[C]fore.
Enjoy the song!
Roger in Baltimore