Apologies if this has been asked a million times before, I've had a quick look but will ask.... I have an enclosed chook pen newly built and the fence is 6 foot high on the lowest side. I'm getting my first ever chooks tomorrow and they will be about 18 weeks old. Will they be able to jump out? Do I need a roof? I'm worried about my dog mostly - he is just a cavvy King Charles but gets very excited and may hurt or frighten the chooks if they were to get out when I'm not home! We also got bunnies recently and he goes berserk trying to get to them.