The kennel we take our dogs to is concrete on the inside, but has a door connecting it to a grassy, fenced in area. It was a family run kennel, recently and might I add beautifully renovated. It was on the kennel owners property (which was like 5 acres) which I liked, knowing that my dogs were supervised almost 24/7. I really liked how they had webcams over all the separate kennels, which meant I could watch my dogs (and the staff for that matter) from anywhere I had internet access and the webcam password, which was given to me upon signing in my dogs.