Essex Horsewatch is urging horse owners to sign a government petition for a change in horse passport law to stop stolen horses being sold on.
The organisation is also asking for traders who are authorised to issue passports to be checked by the Criminal Records Bureau (CRB) and for a national passport database to be set up to allow instant access for police and vets.
As of this morning (Monday 6 October) the petition had 205 signatures.
The petition closes on 5 November.
To sign visit: http://petitions.number10.gov.uk/horsepassports/