While I don't have any experience with coops as I'm still in the planning phase of chicken-ing, I can say that hops grow like crazy. But mostly they grow like crazy upward. The higher you can give them something to grow on, the happier they will be. They don'w grow as much horizontally as other vines, though, so if you're looking for more coverage you might need more plants. I would say a single plant given 2-3 pieces of twine to anchor to covers about 2-3 feet of horizontal space. They have nice wide leaves and I don't *think* they're toxic to animals, but you might want to check. It also takes a couple years for them to reach their fullest hight potential. And if you are or know a home brewer, they would *love* the fresh hops. I know lots of home brewers are dividing their rhizomes right now for the spring so you might be able to find a bunch of plants pretty cheap. Hope this helps!