Fire crews worked with a local vet to help free the 35-year-old animal – named Trio – which was trapped in Kings Lane, Coldwaltham.
A spokesperson for West Sussex Fire & Rescue Service said: "At 4.13pm yesterday (September 30) we attended a large animal rescue at Kings Lane, Coldwaltham.
"Joint Fire Control sent the service's Technical Rescue Unit to the scene. Upon arrival crews found one 35-year-old horse named Trio trapped between a concrete block and a fence.
"The team worked with a local vet to bring the horse to safety using specialist animal rescue equipment.
"Trio was given a precautionary check over by the vet and fortunately he swiftly recovered from the ordeal."
5. Trapped horse
Back on all fours ... relief as Trio begins to recover from the ordeal Photo: Eddie Mitchell
6. Trapped horse
Trio was checked over by a vet before being given the all clear - and a welcome bale of hay Photo: Eddie Mitchell