Anything that is washable is good. Vinyl tile, laminate remnants, linoleum etc. You'll most likely cover it with some type of bedding like shavings, sand, straw, etc. I'm using left over wood laminate planks for my coop floor because it's what I have. It won't last forever, but it will easily pop apart and come out if I want to replace it. I thought about sealing it with some type of polycrylic too but I think it's unnecessary. I've seen how the floor holds up in my house with my accident prone child. It does great with moisture. I'd go to a flooring place and pick up anything cheap. I think the solid piece of linoleum would be better for longer term use only because seams are were the most damage occurs.