My dogs will stay out and wont actively try to get in, but should a bird get out, all bets are off and all training goes out the window. Raccoons are an issue, too. The coop itself should be solid. We are converting an old shed. The run will be about ten feet wide or so. Hubby is out buying more fence because the 40 feet he bought isn't enough. I'm actually not sure how tall the chicken fence itself is. It's taller than the super yard. Oh, hubby just said it's 4 ft. He also just informed me he spent $240 on the fencing!