this is not for dogs who are persistent in getting out!  My little female, 10 lb Tibetan Spaniel can just right over it.  My male is not nearly so agile, so it works fine for him. Any medium sized or larger dog would be able to push it over. I'm using it to keep my little male dog from rushing to the front door when the doorbell rings.  He likes to rush outside and take himself for a walk.  

easy to use, attractive
easy for a dog to get out