A woman is being treated for serious back injuries after being thrown by her horse, which was being chased by a dog.
Georgina Clinton, 41, is being treated for two fractures to her back following the incident in Tilgate Forest on Saturday afternoon.
The large dog broke cover while she was riding, spooked her horse into running, and then chased after it.
Sussex Police say a man who was with the dog did not stop to help her.
They are appealing for information from anyone who witnessed the incident - in the Golden Mile area of Tilgate Forest at about 3.30pm on Saturday February 27 - to come forward.
A statement from the police said: “The horse was startled by a large black dog which gave chase, resulting in the rider being thrown from the animal.
“The dog is described as large and black - bigger than a Labrador - and wearing a silver collar.
“A man was with the dog but did not stop to assist the rider, who was taken to hospital with back injuries.
Georgina’s husband Darren told the Observer: “The dog walker basically left her there.
“She had to crawl back to the horse yard, from where she was taken to hospital.”
Although it may be a long time before Georgina is completely recovered, they hope she will not need surgery.
“She’s got to have physio,” said Darren, “and obviously she’s on strong medication.
“Hopefully she’ll be coming home this week, but obviously we’re waiting for the doctors to find out.”
Although Georgina is a regular horse rider, Darren said he didn’t know of any other local incidents involving dogs, though there had been some issues with mountain bikers.
Anyone with any information can contact police on email@example.com or call 101, quoting serial 596 of 01/03.
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