DCA now hasTSA Pre-Security check is available for select frequent flyers and for military active-duy service members (contact TSA 571-227-2829). It is presently available at Terminal B, South checkpoint-for Delta Airlines.
Australian cattle dogs, also known as blue heelers, are herding dogs. The nickname blue heeler comes from the unique coat color of the breed and his habit for nipping at the heels of the livestock with which he works. The blue heeler is friendly and sociable, making him a great pet.
Known originally as the Blue or Australian Heeler, the Australian Cattle Dog has been a huge help to the Australian beef industry, enabling farmers to maintain huge herds. That is directly from the American Kennel Club webpage about Australian Cattle Dogs (or Heelers). I guess in a sense what he said is basically true.