Cerberus K9 Services, based in Stratford-upon-Avon, has its own Dog Section headed up by our Operations Director, David Hollis, offering professional Guard Dog Security services throughout the UK, including the local areas of Birmingham and Coventry. David Hollis is a former RAF Police Instructor and currently a Trainer Accredited by the National Association of Security Dog Users (NASDU) in General Purpose and Detection Dog Handling.