i have added the rear leg IK as shown around 9.30, but the rear leg starts to go all over the place when i move the IK target bone. i see elsewhere (https://cgcookie.com/questions/7596-rigging-becoming-an-uncontrolable-mess-help) that you have mentioned double transforms, but i am not sure how to fix this, if indeed this is the problem.
thanks, julian
jjuliandarley Could you provide a download link to your .blend file? I'd like to take a closer look.