...you spend more $$ to have the front entry screened in, so your kitties can see what's out front too.
...your first consideration when planning a vacation is who can take care of the kitties.
...you don't buy leather furniture anymore, because declawing is a no-no and fabrics are easier to replace.
...you have multiple scratching posts and several tree houses for said kitties to play in and scratch claws on.
AND...the biggest (maybe)...you ALMOST think it's normal to see a cat sleeping above your kitchen cabinets. I still struggle with this one, but THEY are winning.
