It was raining and we were running late so I left the gate open when I took the kids to school. Came home to find a medium sized dog in the yard. We have 6 ft chainlink around the entire lot.I pulled in and locked the gate.The dog ran to the back where there is a corner of trees. Due to a dog attack last year I did not get close. I went straight in to call AC. Went out with a stick in hand to see if I could see the dog.Nowhere. I walked the entire yard 4 times,and even brought out one dog to sniff out the stray. I called AC to cancel. There are no holes in or under the fence. I just can not figure out where this dog disappeared too. I have not let the chickens ,dogs,or cat out to roam the yard.Don't want my kids out when they come home either. Could this dog have somehow climbed over,or pushed under the fence? I am thinking under but I checked the fence line and can not see how that dog could have pushed his way under it. I can see how easy it is for dogs to get at chickens if they really want too!