Twenty four horses were rescued from neglect and suffering in Cambridgeshire last year, the RSPCA has revealed.
New figures show that 886 horses remain in the charity's specialist equine centres and private boarding stables - despite 328 being found new homes in 2018.
It comes as 90 horses were rescued nationally a month last year in what the charity calls an "ongoing horse crisis".
Dr Mark Kennedy, equine welfare specialist at the RSPCA said: "We have been dealing with the effects of the horse crisis for almost seven years now, seeing sick, dying or dead horses up and down the country being neglected or dumped like rubbish.
"It's heartbreaking that we had to rescue more than 1,000 horses nationally last year.
"We and other charities are struggling to cope with the large numbers continually coming into our care. We need help from fellow horse lovers.
"Please consider adopting your next horse from a charity instead of buying.
"Not only does it mean you won't be inadvertently funding irresponsible breeders and dealers but you'll be freeing up a space in our specialist centres for another needy horse."
The charity's Adoptober campaign aims to showcase the RSPCA's horses and ponies' versatility and capability.
Mark added: "Many people know how rewarding rescuing a dog or cat can be and what a fantastic range of animals come into our care looking for new homes.
"We really hope horse people will see that it's the same for horses - we have some excellent horses and ponies just waiting for a chance in a new home.
"Seeing horses who have had a bad start in life developing into fantastic companions or successful riding and competition horses is incredibly rewarding, made even better by knowing you are helping other needy horses by freeing up spaces for them in welfare charity care."
The RSPCA centres have hundreds of rescued horses and ponies and many more are being cared for in private boarding stables or looked after by foster carers.
Anyone in a position to offer a home to one of the RSPCA's rescue horses can visit the charity's rehoming pages at https://www.rspca.org.uk/findapet/rehomeahorse
Or offer a donation to the RSPCA at www.rspca.org.uk/donateadoptober
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