Does 'Inverse Kinematics' override other bone constraints? Rig is for a quadruped, I have IK applied at second bone, but I want to place a limit on the to the toes, so that they can't go below 0 on the Z axis. Selecting  the Limit Location bone constraint doesn't appear to be honored when striking a pose. 

Any ideas?
I think I found the issue. My active 'Copy Location' constraint was overriding my "Limit Location" constraint. Priority in the constraints appears to flow up to down.