A horse that bucked a B.C. groom at his wedding in a viral video was likely stoned out of its mind.

According to a video obtained by CBC, someone is seen feeding the horse what appears to be marijuana just before the wedding.

The Snapchat clip is only nine seconds long.

In it, a man is seen approaching the horse in its trailer and turning to the camera to reveal a handful of something grassy. A video caption says: "feeding the horse weed #thebadguy."

CBC spoke to the horse's owner who believes it was probably marijuana.

"I thought he was feeding her grass or alfalfa," Zsa Zsa Stiasny told the broadcaster. "I think in fact he did feed it weed. It's possible it contributed to the horse getting all reactive."

She said the horse is usually very calm and the pot theory could explain why it was so spooked when the groom climbed on its back outside a Surrey temple last Saturday.

The SPCA is reportedly looking into it.