A Horse Never Goes Heartless

I've been both inside and outside, with rain.
Sunk like an old traveling horse with an itchy leg.
I've sinned thousands a time an sewn heavy.
'O three times those sins I've alonged those miles and dug holes for this west somewhere else.
'O three times those sins I've shrunk in the dust and dug desert holes for this west somewhere else.
I haven't been walking less.