The Habitat Haven simple security barrier for your pet door is a highly effective way to deter and inhibit access through your pet door by anyone other than your furry family members! These steel barriers are installed outside, in front of a dog door, such that pets can easily maneuver around it to use and access the pet door, but quickly thwarts any would-be burglar or intruder seeking to use the door as an access point. Especially when combined with wall installation and concealment, this is a burglar-proof method for a safe and secure pet door.