Impervious to dog pee is a tough one. The problem with Marmoleum is the installation glues and the tiles themselves can take a long time to offgas. What I like about it is that the tiles are gorgeous and safe, after the installation glues off gas.
If you are fine with the sample tiles, then it may be a good idea to find out when they were manufactured to make sure that you’re testing something that hasn’t had years to offgas. It would be great if they could give you some glue to put on something that you can tolerate and test that outside somewhere (on a piece of wood or something).
Solid pre-finished wood is great, but if the seal breaks (which dog claws can cause), dog pee can penetrate the wood. Another option would be a tile floor ( ceramic tile is likely be more dog pee resistant than natural stone). The grout will likely not be resistant, but grout is cheap to change out after your dog is housebroken. Make sure that they don’t put in too much tile setting material so that the grout completely covers the tile setting material.
In some areas, no one uses tile so it doesn’t improve property values. For that type of thing, I usually ask 3 to 4 local realtors.
Make sure to give our how-to guides to your installers so that they don’t inadvertently introduce a toxic product by using the wrong method even if using good materials.

Very interesting post, thanks for sharing!
outstanding post! great advice, will take on board!
Great blog. A great deal of useful information here. I will be mailing it to a couple friends and also bookmarking it in delicious. Not to mention, thanks for your work!