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After many hours of scratching my head trying to use that quadruped rig, I searched and found your comment. I guess logical minds think alike. I totally agree with you. It seems like this quaduped guide was not for a horse. However, that being said, there is a great rigging tutorial (very long) on digital tutors, if you have the patience. He goes step by step and without skipping any important ones, like the specific anatomy of the animal. If you have found since a solution, like removing rotation or translation constraints, please let me know
Tor Marquis