12-22-2012, 05:18 PM
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Like others have said, there is no pain killer that will relieve pain for that long of a stretch. That's why painkiller prescriptions are given in hours, not days or weeks or months (i/e take one pill every 4-6 hours; take 2 pills ever 24 hours, etc).
Odds are that she was either injured at some point in her past and has just now started having pain with it (the previous owners may not have even known if she was injured before they owned her and she never had soundness issues while they had her) or she injured herself at the same point that she started showing pain after you bought her.
Point is, unless you have a signed contract that the mare was sold as sound/healthy AND you have undebatable veterinary proof that the mare was injured while in the possession of the folks that you bought her from, then there is absolutely nothing you can do about it.