I am new to the goat world and I have been wondering how much space each nigerian dwarf needs. I know it varies depending on your set-up. In this case I am in central TX where the grass is okay but not the best (especially this year!) and I would like the lots to maintain grass...not just become a dirt lot. How much area is needed per goat to keep the grass? Basically I don't want to create a situation where everything is overgrazed. Any rough ideas?