Originally posted by Faceplant8:

It's kind of a catch-22, you have to be near the farm for them to breed, but then they are in danger of the events.

Really? Define "near" We usually put farms and Breeding pens a short way away from where we have our bass for this exact reason. 9/10 the Event spawns cantered on one of us and the Pens are at worst on the edge of the spawn circle usually just outside.

The only time we've had issues like the OP when we put the Pens as part of the main crafting complex?

That said yeah basic Roof at least or an enclosed "pen/Bunker area where the little guys can run too works as well.