I am looking to eventually clear some of the underbrush in my wooded areas and was told that sheep will eat the same things, Poison Ivy, Greenbriar, etc. that goats will. This was suggested as an alternative to the difficulty in keeping goats in a fence, especially one that is non permanent and being moved around. Any thoughts? I would rather keep sheep anyway for the wool and besides they are better looking and better tempered (IMO). Thanks in advance!