We just introduced our 2 dogs to the TT. One is a 4 yr old Siberian Husky the other is a 1 yr old Australian Shepard. Both very active dogs and destroyers if bored. We didn't leave them alone at all the first weekend we went. The second weekend, we left them for about 20 minutes by themselves. Never left CG though. Went for a walk around the CG to see what we heard out of them. BUT they were tired out from a long walk(these dogs get walked every night a mile each)and they had the radio, and air conditioner left on for them. My Aussie is a barker. We been working on that, but it is a outside issue, not when she is in the camper. They were fine. Not a peep out of them. We have never crated either of them. They get the whole run of the camper. They just laid down and slept on our bed. But we do not leave them alone for hours at a time either. IF we will be gone longer than a hour, they go with us and stay in the truck.