[Little Bit]

I bought some plastic mesh, it's think with big holes like chicken wire, but plastic. I put it over the ground in the whole doggy yard. I secured it with the staple things you press into the ground to hold ground cloth. The grass grows right up through it and it becomes invisible. They can't dig through it and it doesn't rust and break. So far so good! I think I posted pictures of it in a thread a while back. If I can find it I will post the link.

Hope this helps.