Should we get a new pet?

Our landlord let us have a cat after almost a year of convincing, (not our fault, previous renters), I want to get a hedgehog, my husband and I researched hedgehogs and know how to take care of them, I want to get one without telling our landlord because they don't really stop by unless of an emergency, and hedgehogs are quiet and don't stink or anything, but my husband made the mistake of asking our landlord about it and she said " absolutely not, we already let you have a cat" I still want to get one, and it's not like we are gonna be here for a long time, as soon as I find a full time job we are moving into our own house, and due to the fact they're never here we can keep it out of site in case they do stop by