There are many floor treatments available. Tile is heavy and requires a very stable underlayment or you'll get cracked or popped tiles. Carpet provides sound and heat insulation from road noise. Vinyl or linoleum can be slippery when wet and hard for dogs to get traction on even when dry. Wood and wood laminate floors are popular, but do have the sound and heat issues. Measure the area and visit a good store with lots of choices.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI