Didn't you know a Black Labrador is standard issue kitting at Cranwell! I don't think it's a rank thing, it's just generally speaking Officers have their own office to keep them in! Imagine the Lineys bringing them in to work, it would be impossible to manage - and you've have a fight on to keep the Lekkies away!
I believe at Wyton they are banned for example, so I suppose it's one of the few perks left - provided you have your own office and you're on a proper Stn of course!
