Filming of scenes involving horses for the original HBO television series "Luck" has been suspended following the death of a third horse used in the series, according to a written statement posted on the American Humane Association (AHA) website. The AHA establishes animal welfare guidelines and monitors the treatment of animals used in the film industry.

"Luck" is an original series of the premium television network HBO that depicts some aspects of the horse racing industry. During filming of the series in 2010 and 2011, two horses were injured and subsequently euthanized.

On March 13 a horse being used in the series was inspected and passed soundness checks by a licensed veterinarian. A groom was walking the animal back to its barn at the Santa Anita Racetrack, in Arcadia, Calif., when it reared up, fell backward, and was injured, the AHA statement said. AHA certified safety representatives were also on the scene.

The attending veterinarian provided emergency assistance to the animal, the statement said