Our chicken area is secure, the chickens don't get out (I put a net over it). However, the neighbours also have chickens, they fly over the 5 foot wall I made and get eaten by my dogs. According to local by laws, I have to pay a fine, which I find most unfair. Anyway, I am going to build a fence on top of the wall, no expectation of the beloved neighbour building one, to stop this. He likes to see me losing money. How high? Eight feet enough. or should I go higher while I am at it? Thanks.