My two puppies are names Max and Rex. There are Great Dane breeds and are just 6 months old. Both of them are very naughty and can turn the house inside out in few minutes. Now Max has begun a new game, that is to open the single hung window in the living room and run out. I am okay with him going out, in fact I take them out myself everyday, but it isn't safe for him to venture out monitored.There are raccoons in the area and one of our neighbors puppies were killed dues to their attack. I don't want such a fate to fall upon my puppies. So I am planning to fit a security bar in the windows. I don't think I will be able to stop them otherwise. If you know any tricks to do that please share with me.