I simply painted my plywood floor. Sealed the edges with caulk and then 2 coats of oil based primer, 2 coats of exterior paint. Seals up the floor nicely, no slip, don't have to worry about vinyl coming up or water getting under it and rotting the floor (or getting moldy). And best yet - it was FREE because it was left over paint. I have about 5 inches of shavings on top and fluff it weekly with a garden rake. Sweep out all shavings twice a year and whatever poo reached the floor (which is really minimal) washes up with basic soapy water. If you use the squares, they will eventually lift off when you catch them with your rake...