You cannot add rules as you go along. Once these rules are set, you must never, under any circumstances, break any of them. Dare to break a rule, and you will never live it down. If you can remember how many cats you have, you don't have enough. Unknown Cats don't bark and act brave when they see something small in fur or feathers, they kill it.
Dogs tend to bravado.
In the great evolutionary drama the dog is Sergeant Bilko, the cat is Rambo. All of the people in my building are insane. The guy above me designs synthetic hairballs for ceramic cats. Steven Wright Cats are kindly masters, just so long as you remember your place. I put contact lenses in my dog's eyes.