All owners or trainers of guard dogs shall, in addition to the requirements provided in Section 3-168, comply with, but are not limited to, the standards of this Section whenever any dog is to be trained or used as a guard dog. Failure to comply with these standards shall be grounds for denial or revocation of the license. Dogs being trained or used as guard dogs must be able to demonstrate obedience training, but they shall not be subjected to cruel or inhumane treatment prohibited by State law or this Subtitle. Guard dogs must be under the control of a responsible adult handler when they are being trained or utilized. Kennel, training, and work site areas for guard dogs must meet the following requirements; Runs must have at least six foot (6') fences completely surrounding them to which anticlimbers are added at the top or the top is completely covered and anti-diggers at the bottom of the runs. All gates and entrances to the runs, kennel, training or work site area must be kept locked so that the public is unable to enter. The kennel, training, or work site area must be enclosed within a building to which the public does not have access or by fences at least eight feet (8') high to which anticlimbers and anti-diggers are added. Fences must be kept escape proof. Guard dogs may not be allowed in any area to which the public has access unless they are securely restrained, humanely muzzled, and under the control of an adult handler.