my DH and I are about to put up a fence/run for my 6 chickens (3 EE's and a trio of SF). We have in our thoughts of putting a pair of small breed goats in there with them some time in the future...Our debate is either to make it 4 or 8 foot tall...with steel post, locus post, or landscaping timbers. It will be about 40ft by 80ft. I am worried about them just flying up on top and jumping down on the other side if we make it 4 foot high. I would love to hear any advice...thanks in advance...cathy