Arg, I know I'm going to get chewed out for this... but you can always throw a little hay over the fence now and then... just to tide them over until the gov't gets involved....
Thats what I do. A lady owns property adjacent to the boarding stable and she has 3 goats and a bizillion and one feral cats. They have eaten EVERYTHING and I don't know if she feeds them besides the weeds..... so I throw orchard grass over the fence for them every now and then.
Apparently the BO of the boarding stable throws alfalfa over for them too.