Ditto! Military spouse living in post housing at the moment. We were worried about the pet limit as well. The housing is run by a managment company here. I went to their website to find info regarding pets. I found out that we can get an addendum for additional pets. So all we need to do is fill out a questionaire with the new pet's info, sign it and turn it in.
If you have to live in an apt, maybe start training them now for barking and manners? I'd imagine it could be fairly stressful trying to hide an additional pet if you were worried about a sound or behavior giving you away.
Ivy