The dog license tag issued to any dog licensed pursuant to this chapter shall be securely affixed to a collar, harness, or other device and shall be worn by such dog at all times that the dog is in the City, except when the dog is confined in a commercial kennel, hobby kennel, or veterinary facility, or it is being exhibited at a show, field trial or other competition. The license tag shall be shown by the owner/guardian at any time upon demand by the licensing agency or its representatives.