If you have any animal that is able to get to your screens in your window..PLEASE take note that they can EASILY go through them!! My husband and I left the house the other day without Damien but we were in Damien's car..(yes he has a his own car,lol) anywho...he knws that when we go somewheer in his car it is either to traing,a walk,or tracking.He was so desperate to come with us that he jumped onto the couch and right through the screen! We had no idea this had happened!! THANK GOD that he wondered into our niehbor's yard and was seen.The nieghbor brought him back over and put him in the garage.Now...German Shepards are naturally cautious of people they don't know well..he knows our nieghbor,but not well...but because of his training and us socializing him since the time he was 6 weeks old..he overcame his cautiousness and went with the nieghbor back to the house.PLEASE DO NOT leave windows fully up if you leave the house..take it from me...they WILL go through them!!