They will eat everything. I have some poison ivy as well and they munch it down like it was a Cesar salad. They act a little funny after eating it but they are still alive and well. Make sure your fences are mended not so much to keep the goats in (goats don't roam very far from the safety of home) but to keep predators out.
Goats often can be had for free but otherwise generally aren't very expensive. Like RAMSinLA said, you need to keep the predators away from them and also watch to see that they don't stray too far at first. We used to actually use those little screw things that you put in the ground and clip a cable to it if we had areas we wanted them to concentrate on. We would then just move those around as necessary. We had cattle and horses for the most part so our fences were not very good at keeping predators out. We had more problem with keeping the goats away from the house than trying to keep them from straying. One of them would run inside the house every time we left a door open.
Yeah - you can actually rent them in a few areas. I had a guy come out in Portland and he set up a little pen for them and set up an electric fence with collars on the goats for an area next to our creek that I wanted to clear of brambles. Worked like a charm.
One of ours we called Rudy (de-nutted with the ole rubber band trick) used to sneak up behind you and butt you in the back of the legs. Not hard but when you turned around, he'd do the whole - up on the back legs with his head tilted and try to get you to butt him back. We'd just thump his head with the sole of our shoe and he was happy.
Yeah - my parents have several of those hay burners. Give me a mule any day.
Ooh - good point. Keep that in mind with your horses too. Bastards will eat the stubble off of stubble. You may want to cross fence your pasture if you weren't already planning on it.
