E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A game of cards; so called from the four points that are at stake, viz. High, Low, Jack, and Game.
To go on all fours is to crawl about on knees and hands like a little child.
It does not go on all fours means it does not suit in every minute particular; it does not fully satisfy the demand. It limps as a quadruped which does not go on all its four legs. Omnis comparatio claudcat (all similes limp).