So here is my situation. Im moving into a house on acreage, and behind the house is a fenced in run(just metal wire and Tposts) with a small three sided shed built of old fence sections. I plan on tearing down the shed and building a coop there, and I think I have some decent ideas as far as that goes, so that's not an issue. My problem is on how to predator proof the run as best as is reasonably doable within a decent(maybe 200 dollar) budget and a week or so of work. Doesn't have to be anything extravagant, functionality is the name of the game here. I don't know the exact size of the run, but Id guess maybe 30-40 feet long and about 10 feet wide. Fence is maybe four feet high, my main predatory concern is dogs(I know other predators are a concern, just based on the area Im most concerned about dogs and various small animals like racoons). Is a tarp a viable option to cover a part of the run to allow the chickens to retreat into, or will it just get torn through? I really just want to be able to walk the length of the run inside and not stoop down, and I would prefer to not raise the fence any higher, so I am most interested in a way to cover the pen but remove the top with ease. Any suggestions or ideas? Im not new to chickens, but my experience is all based on commercial poultry raising and so I am a little unsure of how to go about managing a small non commercial flock. Thanks for any help yall can give!!