[Cagdu] Flying question: why are the relief areas outside the airports?

[Fred's ol' XP]

Hi CaGDUdettes and CaGDUdes,

On my last few flights, I had a question pop into my head.  Have 
y'all wondered this?
OK, you get a phone call right after your dog finishes wolfing down a 
meal.  You have to be on the next flight to wherever.  You show up at 
the airport, relieve your dog, and tromp into the airport.  Your 
flight leaves a little late, but your dog is well-trained, gets 
small, and sleeps in an impossibly small space under the seat in-front of you.
At your next airport, you have about an hour between flights.  No 
time to relieve your dog outside the security wire, but why do we 
have to leave the airport to relieve our working dogs?
If Homeland Security and the TSA has dozens of dogs working at the 
airports, that means that they have relief areas inside the 
airport.  So:  Why can't our highly-trained guide dogs use the same 
relief areas as the guide dog drop-outs that are working for the TSA 
as  baggage sniffers?

We all come in.  We all get screened.  Why can't our dogs do their 
business inside the airport?

Fred Chambers
VP - Beach Cities Chapter, NFBC