My 3 coops have hardware cloth ranging in size from 1/2 inch on the sides of the banty pen to 2x3 on the LF pen with regular chicken wire around the bottom 2ft as further protection & to keep chicks in. Top & bottoms of all runs are 1 1/2x2 or 3x4 & bottoms are covered in a couple inches of sand.
Like you, I'm in town (tho I have a woods out back due to my particular location) and have only had cats, dogs & other birds to deal with. The worst of these is the cats. Don't think they can't climb your fence!!! I regularly find not only my own cat (who knows better than to touch my birds) but about 8 neighborhood cats perched on top of the pen watching my babies or even just sunbathing up off the ground (cats are like that). My cat seems to think it is her personal jungle gym & climbs right up the wire.
Like you, I'm in town (tho I have a woods out back due to my particular location) and have only had cats, dogs & other birds to deal with. The worst of these is the cats. Don't think they can't climb your fence!!! I regularly find not only my own cat (who knows better than to touch my birds) but about 8 neighborhood cats perched on top of the pen watching my babies or even just sunbathing up off the ground (cats are like that). My cat seems to think it is her personal jungle gym & climbs right up the wire.