Well I figured out how to throw the "we are not paying equal rent because your animals are in the living room" in their face. If I am paying an extra $60 because my animals are in the living room, then technically I am renting the living room as my own personal space for $60, right. Well, then their cat and their ferrets are no longer allowed in the living room. Simple. That gets the cat away from my dog and sugar glider. If they want their cat to be able to have the run of the house, then they need to cough up the extra $60 to make the rent even.