How would these stand up to large volumes of urine (aka doggy daycare)?

Our Flagstone Rubber Pavers are semi-porous and would be able to withstand large volumes of urine. To help mitigate the smell that could be produced, we would recommend hosing down the tiles frequently to keep the uring from getting trapped in the tiles. Also, you could use our Turf Fresh spray on the tiles to also mitigate the smell that could be produced.