A person may recover reasonable attorney's fees from an individual or corporation, in addition to the amount of a valid claim and costs, if the claim is for:
(1) rendered services;
(2) performed labor;
(3) furnished material;
(4) freight or express overcharges;
(5) lost or damaged freight or express;
(6) killed or injured stock;
(7) a sworn account; or
(8) an oral or written contract.
Acts 1985, 69th Leg., ch. 959, Sec. 1, eff. Sept. 1, 1985.