Goats will chew the bark off your trees, eat your shrubs, climb on your cars and trucks, and unless confined be a pain. A miniature horse, you can find them fee on craigs list or very cheap. They nibble the grass short, their manure is dry and easy to pick up, or leave it for furtilizer. They can be house trained too. Sheep graze short too, and you can eat them. Either way, unless you have a lot of yard, you will have to supliment their food supply.