Zenyatta, a 6-year-old thoroughbred, went undefeated in 19 straight races, 60 Minutes reported in 2010. Her trainer, John Shirreffs, who died last week at 80, shared her unusual diet. “We give her aloe vera juice because it’s good for their stomachs. And then, if she’s been really good, I could pop open a Guinness and she could have a beer in the afternoon,” Shirreffs told 60 Minutes. He added that if he offers another type of beer, she won’t drink it. #horsetraining #horsetrainer #racehorse