water-proof cover for floor time?

Most folks use those 1.99 shower curtain liners I think. I just use a really thick old furry blanket. Too thick for the pee to make it through..

Shower Curtain liner works good or a tarp from the hardware store as well.
I get mine at Menards for under $2.00 for a 4x8ft sheet. Like Slave stated before you can use a super thick old blanket or a couple of thick towels would work too.

I use one of those cheap vinyl table cloths with the fabrics backs and put the blanket on top of that. That way, if pee goes through the blanket, my floor is saved by the vinyl ^___^

Why don't you just put a few layers of newspapers like maybe 10 a space?

I usually use a picnic blanket

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It's got a waterproof bottom to it, so it's soft for them to run on and they can't pee through it.