NZB Gandalf, an eventer piloted to the 2008 Olympics by Mark Todd, was euthanized due to a neurologic disorder, Horse and Hound reported.

New Zealand Bloodstock, Todd's sponsor, told Horse and Hound the horse suffered seizures that left him blind in his right eye and a danger to himself and handlers. He was 11 years old.

"It was a very hard decision to make but the wellbeing of the horse is what we have to consider foremost," Todd was quoted as saying. "It's also sad for New Zealand eventing to lose a horse of his caliber. Unfortunately we didn't get to see the best of him."

Todd retired from eventing following the Sydney Olympic Games in 2000, but announced a comeback in January 2008. He and NZB Gandalf placed 17th at the 2008 Olympics