Following a two-hour rescue operation by the Isle of Wight Fire and Rescue Service, a vet took the tough decision to put down the 22-year-old animal after it collapsed into a ditch at Hill Farm Riding Stables shortly before 13:00.
It is believed the animal suffered a stroke.
Firefighters from Freshwater and Newport undertook the task of pulling the horse free with the assistance of the Animal Rescue Unit from Newport Fire Station.
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