Pets and stone go well together. A sealed marble floor should be fine. A ruined stone tile from animal leaks would be rare. But I guess, if you look at the Laws of Probability, it *will happen to someone sometime in the future (or the past...whichever). Will it be you? Probably not.

But you have asked the *what if* part of the question. So...the answer is, it isn't that difficult to remove/replace a stone tile. That's assuming you get a stone professional or a tile setter who is at ease with marble tile, to come in and get the work done. You will be looking at a 'job minimum of (today's wage) of $50/hour with a 'minimum' of 4 hours of work (or 8 hours...depends on how skilled s/he is and how much in demand s/he is).

So long as you purchase more than 10% waste you will be more than fine. The hex sheets will be more trying to remove/replace but actual stone tile isn't a problem.

And when I say "isn't a problem" I mean the physical side of the job. The COST side of the job is not something I can speak to. Only you and your family understand what $200 - $400 for a few hours of work mean to you.

Fieri - thanks for your point about heating cables ... actually we were planning on radiant floor heating, I didn't even think about that being a factor in replacing tiles ...

Pets and marble actually do NOT go well together. Urine and vomit (which can be a major problem with some cats) both etch marble immediately. Have you considered marble-look porcelain tiles?

Random advice from experience:

-- Do not place a kitty litter box on a heated bathroom floor -- enhances the smell

-- Pets will choose the most unfortunate location to vomit; e.g., on the only area rug in the entire house or on your favorite bedspread

-- Even a dog who is reliably house-trained will sometimes urinate indoors -- especially in an unfamiliar setting