You can run a few strands of hot wire around your pen to discourage dogs and coyotes. One about 8 inches from the ground to discourage digging and one around the top. You may also want to run one about a foot off the ground inside your pen to keep the goats off the fence. They are terribly hard on fencing. My goats eat pasture only for 8 months out of the year. Nov. thru Feb. they get grass or oat hay but they are pets only, we don't milk. They have an open barn with a east and south wall only but has pipe fence and a gate so I can lock them in there at night. Good luck and have fun with your new additions!
