Okla. Stat. tit. 15, § 15-379: Proceedings against principal, surety may require

A surety may require his creditor to proceed against the

principal, or to pursue any other remedy in his power which the

surety cannot himself pursue, and which would lighten his burden;

and if in such case the creditor neglects to do so, the surety is

exonerated to the extent to which he is thereby prejudiced.