W. Va. Code § 7-10-5: Destruction of animals.

Any humane officer or animal shelter lawfully may humanely destroy or cause to be humanely destroyed any animal in a manner consistent with the provisions of section four of this article when, in the judgment of the humane officer or director or supervisor of an animal shelter and upon the written certificate of a regularly licensed veterinary surgeon, the animal appears to be injured, disabled or diseased past recovery or the animal is unclaimed.