We own an Austratlian Shepherd and she just turned 15 years old. It seems the older she gets the wiser she becomes. After years of having a standard child's type gate to keep her secure in the family room while we were not home, she all of a sudden learned to pull at the gate with her paws until she had an opening large enough to get through. When we purchased one that was permanently mounted and could not be moved, she all of a sudden learned to get over the top of it and when we would come home she would be greeting us with slobber all over the front picture window. We shopped around and found this powder coated metal white extendible gate which came with an optional top extension (best purchase) at Petsmart and so far so good. Unless our Sasha can suddenly turn into superdog and leap over tall buildings, we should be good for a while. She is getting older so we want to keep her safe while we are not at home. This gate fit into our 34" opening and can go as wide as 41-1/2". Check out Petsmart in your area as they did seem to have the best selection.