Decent pet door, locking mechanism too flimsy

The original pet door I had with my house was this model so when the plastic lock on the bottom was broken off by my cat, I bought another to replace it for if I went with a different model I would have to replace the entire door. While it looks nice, and has an "only in" and "only out" function, the mechanism on the bottom can be too easily broken, and when that is broken, it no longer locks. For security, and preventing pets from escaping, I feel like this is a lousy thing to be cheap on. If you are worried about security, know that a 9 pound cat can break the lock, which mine did.. and escaped during a vacation, only to find herself stuck outside since the broken piece prevented her from getting back in. I now place a heavy container in front of the door when I leave for extended periods out of fear of losing my cat again.

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