Hello and welcome
First of all Happy belated birthday .
I can certainly relate myself and illusion as he has mentioned have a zoo. We have 5 ferrets, and 3 cats. Our gf has 2 cats as well. Since she spends so much time here with us and basically only goes home to feed and spend time with her cats we have suggested that she bring them here for a trial weekend to see how things go. Her cats don't have claws are do so there may be conflict there. Her cats have never been exposed to ferrets either so she is quite concerned. However with introducing any new pet there will always be the original assessing of dominance and if we are here to keep an eye on things it should be fine. I believe that most people in the poly lifestyle have pets because we all have the ability to give so much love as most pet owners do.