I'm about ready to give up, but, i'm stoked you will seek out a behaviorist to help you help Zara and Bella.
//"Like I said just wish I knew someone else with a dog - my friends have cats or one has a gerbil (i have 2) lol so they no help."//
If you do locate ppl with dogs,
they may not have any knowledge on how to best approach your dogs having possible aggression issue.
Their dogs may have exact wrong type of personality for your dogs to work with.
Helping rehab aggressive dogs,
is a lil more involved,
than just finding other dogs,
or friends with no training
to help you figure it out as you go along.
If your dogs do have aggression or FEAR issues, they are way more likely to bite.
Please google "Fear Biting",
it is common in shy or anxious dogs, so Bella may be prone to this development if mishandled, and tends to get worse as they get older. not better. Unless treated with counter-conditioning, etc
that is GREAT Bella hasn't bit anyone yet, but, she is in risk group for this behavior to develop, so you'd want to proceed with best trainer/behaviorist you can find, to head off whole issue escalating to biting. It could.
Lol, most of the articles i find on it, are not great enough to post, as they all have something in the article i didn't like.
Like this one:
(the last lines kinda bite, and, as usual, they make no reference to the fact it is genetic disorder)
http://www.petfinder.com/pet-training/fear-biting.html
GOOD LUCK!