The animals were 'terrified of humans' when found but are expected to make a full recovery.
A spokesperson for Caerphilly council said neither it nor Merthyr Tydfil council had responsibility for the horses.Sarah Hollister, head of equine welfare at HorseWorld, said: "The positive news is all five ponies are doing really well now and are expected to make a full recovery."
She said her team had started some "very gentle" rehabilitation training with the ponies to help them get used to being handled. Ms Hollister added: "For ponies like this, that have likely never had human contact, we start with a glove on a pole and slowly get them used to being touched with the trainer remaining at a comfortable distance for them.
"As they accept this, we can move a little closer. This is a long slow process which is never rushed, it takes as long as it takes. The welfare of the horses, their comfort and happiness, is paramount."The charity said it could take years for the ponies to be fully trained and ready to embark on the new lives ahead of them.
It added: "Whatever lies ahead, once a horse or pony comes into HorseWorld's care we guarantee they have a home for life.
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