Firefighters released a horse trapped in a horsebox which got jammed under a bridge.
The uninjured 20-year-old mare, Clara, was sedated by vets as crews used rescue equipment to cut her free.
It is believed the driver was directed under the bridge in Milton Keynes by her sat nav on Sunday.
Locals said other vehicles had close shaves under the same bridge this week.
Milton Keynes Council said they planned to replace a height warning sign.