Just have to say...people are used to seeing "working dogs" on occasion, including police and/or service dogs...and I think folks generally don't interfere with them or their owners/handlers.
So why the warning?! It's a little off-putting, to say the least...nothing "Secret" about THOSE "Secret Service" agents. So just SAY they're guard dogs, stay back.
Oh wait...if they're mingling amongst people but not to be touched or petted, then wouldn't that scare the sh*t out of anyone unfortunate enough to be randomly sniffed?
Or are they muzzled? (the dogs, not the peops, of course)
0bama has never yet figured out a better way to do anything, including canine security around the White House...I am SO looking forward to "moving out" day for him, 2017...