Not up to Snuff

***WARNING*** THIS SECTION IS NOT DEALING WITH SOUTHERNISMS BUT SOUTHWESTISMS OF DONALD BLACK

This whole expression made no sense to me except for the not up to snuff part.

"When I went to hold Bill's hind leg, I seen he wadn't up to snuff, tricked out in his rump-sprung Sundays and nearly callin' for Earl."

What do think this means. Black gives options but I won't. You jist tell me.