I've seen dogs get nasty sores on their legs from being on the concrete (and only concrete) for long periods of times. He wouldn't be out there for an extreme amount of time but if you add up the hours weekly I feel it would be too much time on the concrete.

May sound like a stupid reason but I just dont like the thought of him on the concrete that much. I just worry a little too much when it comes to my kids.

I'd prefer for there to be grass in there but its not possible (no way my parents would want the run on their precious grass )

Travis isn't a digger. And if he did dig out, there would be a nine foot privacy fence stopping him from exiting the yard. (Our fence is a 6 foot Wooden Fence on top of a 3 foot block wall). I'll see if I can't fix it to where we could prevent a breakout though Better safe than sorry I suppose.

But now I'm definetly going to look into those sprays. Don't want bacteria building up.