Several goatfarmers in SoCal hire out for weed abatement. Goats leave rabbit-pellet type waste, practically disappears into the ground on its own. My favorite, the Lamancha, is a dairy goat which has tiny ears and can be doglike in its behavior. Climbing things and playing King-of-the-Hill seems to be a favorite game of goats, some can be real escape artists!
I like the jacob sheep.
http://en.wikipedia.org/wiki/Jacob_%28sheep%29
If I was going to raise an animal like a goat, I would opt for the jacob sheep.