Tile it. Easy to clean...and if you use an epoxy grout, the smell/stains don't show. Yeah, OK...I'm a "Tile Guy" so I have an agenda....but the truth is there.

Thanks for the advice, lazarus. Good to know about the epoxy grout, too!

We recently put down cushioned sheet vinyl in ours. The concrete wasn't level and was not in good shape, I wanted something warmer than tile (and less expensive since it would have needed pretty extensive floor prep to get the concrete ready for tile), and it's a dog room now but eventually may become guest quarters. The cushioned vinyl has so far been a very good choice for us and it's even textured enough that our dog doesn't slip on it. (He has arthritis so nonslip is best for him. He also anoints the floor with something or other pretty much daily, being an elderly fellow who isn't the same as he used to be.)

Sheet vinyl doesn't add to resale value like tile does, so that might be a consideration for you. But if that doesn't matter to you and you want something warmer than tile, you might have a look at it (it is not the same as it used to be).

Good luck! Having cleaned up after many animals in my time, I never want carpet again. [grin] (We have HW in our main living space.)