Bubbles ((Becky's Hope Horse Rescue / Facebook))

An old gray horse headed for slaughter in Mexico recently orchestrated his escape by slipping into a pack of mini donkeys being rescued by a Frisco-based nonprofit, the group's president said.

Staff members of Becky's Hope Horse Rescue were down at a "kill lot" to rescue several donkeys, which is part of their mission to save abused, neglected or abandoned livestock. Bubbles, the horse, walked right up to their trailer as they tried to load the donkeys, according to a Facebook post from the nonprofit published Dec. 16.

"He was intent that this was his ride out of there," the post said. "We stood there staring as this old guy with crumbled ears from frostbite waited patiently for the group of mini donkeys to catch up so he could jump on the "freedom trailer" out of there."

Sue Chapman, president of Becky's Hope Horse Rescue, told KTVT-TV (Channel 11) that she firmly believes Bubbles thought they wouldn't notice if he mixed in with the donkeys they'd intended to rescue on their most recent trip.

"He's like, 'I'm just one of them,'" Chapman said. "Got on the trailer with them, stood there like 'You don't see me,' and kept his head kind of down."

Bubbles disregarded the commands of the staff at the "kill lot" as he trotted through the gates, according to the Facebook post.

More than 5,000 people have "reacted" to the post and it's been shared nearly 700 times.

Champan and a volunteer, who said she just couldn't bear to leave Bubbles, paid $450 so they could take him back to the nonprofit's pastures in North Texas, Channel 11 reports.

As news spread of Bubble's successful escape, so did donations.

Becky's Hope Horse Rescue has received at least $5,000 since the Facebook post went viral. The organization has been able to use some of the funds to rescue two other horses, Chapman told the station.

"I've never had that happen," she said. "People from all over the world are sending $5 from Japan, $5 from Germany, $15 from England the other day."