"Next thing this car is on the corner on top of us. We had nowhere to go. He slammed the brakes on, locked up and the back end twisted a little bit and he just booted it. The back end clipped my mare's back legs and they went out from under her.''
Candice hit the gravel face-first and panicked as she got up, striking a metal fence standard.
She then somersaulted and partly landed on Chalmers, pinning her legs with her neck.
Chalmers was able to free herself without further incident.
The fence standard left a 15cm deep gash in Candice's chest, while her face sustained cuts and grazes.
Chalmers, who has lived in Kakanui for about four weeks, was unscathed, bar a sore leg and neck.
Candice is recovering in a Kakanui paddock.
She said the incident has put her off walking or riding her horse in the area.
"It's terrified me now. This is supposed to be a quiet wee spot where I can walk my animals.''
Sergeant Blair Corlet, of Oamaru, said police were investigating.
Constable Rory McGeown, Oamaru police station, (03) 433-1400.