I'm keeping my Buffalo fenced, like my other animals, but they can't fit through a normal fence gate. Could you make a double-sized fence gate, or rather, a half-fence-gate that works like a door? You could put two side-by-side for a double-wide gate.

You should be able to get them through if you put two fence gates next to each other.

Justed tested it, two fence gates next to each other work.