Our rescue Samoyed has broken into our chicken coop and run more than once. She has killed chickens in the past so we rebuilt our run last summer using cattle panel wrapped in chicken wire. We have double locks on each gate as well. We believed there was no way for her to get into the run, however she has done it now. . .twice! As hard as it is to believe, that 45 lb. dog with her winter coat can squeeze through a 4 in X 6 in opening in the cattle panel! She pushes the chicken wire out of her way (chewing through if she has too to free is from the zip-ties we use to secure the chicken wire to the fence) and then goes in. Fortunately, the last two times I have found her wandering around the run and the chickens sleeping peacefully on their roosts in the coop. I'm not sure why she has not gone into the coop the last two times. She has done so before. I am sure she could smell them. I know she could fit through their door if she fit through the fence. I also find it hard to believe that I "caught her just in time" both times. In any case, I am glad she didn't kill any. I am fond of this dog and don't want to get rid of her, but no matter how vigilant we are, eventually she slips out the door with out being seen. She would never go near the coop if I am outside, but if she knows I'm not out there, that's right where she goes. Any ideas on what more we can do to secure the run and/or train her to stay away?