These are going to be big destructive dogs.. Mac can grow to 100, and surprisingly Rio 120. So far Mac is much bigger. I wake up every morning hoping they arent starting to tear the house down..lol I keep bones and toys out there, but they like looking up, so anything hanging or like wires run, they get. Luckily i dont have a bunch of kids leaving shoes everywhere. We had a dog Baby years ago that i'm still finding shoes she carted off. Since i was able to train these guys, with the help of the older ones already trained for the wireless fence, they cant cart things off.. They just destroy them in the yard...lol