Boxerproof?
Is there really such a thing? We have ceramic tile in the kitchen and it is at least 20 years old, it has held up well with our three boxers, better then with the kids pulling chairs across the floor. Even the prior owners had boxers and the tile was in great condition when we moved in. If you go with tile, go with a darker color grout to stand up to the stains. We have tile in the entryway with light grout and it shows stains easily. Only problem is when they drip water from their dish and the floor gets slippery. Slate is a great option, as it is usually not slippery. You can check and see what tile is rated for shower installation. I handle insurance claims and when it comes to kitchens, you are better off with tile then wood or laminates in the event of any water damage.If a tile gets damaged, easier to replace than the whole floor. If you are able to do concrete, there are great options and pretty much can't be damaged. Best wishes for your search.