If you give Community Safety a call on 01926 415000 they can advise you of a point of contact for Horsewatch or Ruralwatch locally, depending on how they manage it
Yes there is a Warwickshire Horse Watch, run in partnership with Warwickshire Police. To become a member email watch@warwickshire.police.uk or go onto the website www.warwickshire-horsewatch.info. Lots of crime prev advice and details of local crimes.