1) Walking on all fours 
walking with body parallel to ground
Walking or resting with the body horizontal, denoting the posture of quadrupeds; opposed to orthograde. ... Origin: L. Pronus, inclined forward, + gradior, to walk ... (05 Mar 2000) ... 
Type: Term Pronunciation: prō′nō-grād Definitions: 1. Walking or resting with the body horizontal, denoting the posture of quadrupeds; opposed to orthograde.
pronograde In animals, walking on the hands and feet or resting with the body in a horizontal position.