At the moment I have a dog run. For the base we put down mulch which I don't like. It's not sanitary and you can't clean it. Any suggestions?
I like the idea of astro turf, but it would cost 2000.00 and I need something cheaper that will drain well. Is pea gravel a good choice?

$2000.00 for astro turf!!! Wow!
I've seen that short green carpet which looks like grass and that works really well. I don't think its called astro turf though since it is much shorter. You can find it at camping stores or even Home Depo. Its not really that expensive and it is easy to clean with a hose.