I replace one of these doors about every 3 years but I have 3 large active dogs that go in and out of the dog door daily and sometimes at high speed! It's a quality product and it's only after they've zoomed in and out for a few years that the rubber on the top cracks and they break it. I don't mind replacing it at all because it's very well made and the individual panels are thick and insulated which has saved me money on my heating bill and the dogs 24/7 backyard access. This thick plastic is also very easy to clean and maintain and is much stronger than the thin plastic valves found on other products. This door is a good weight and my cats can easily use it too. If you have small dogs you might need something that doesn't weigh them down, although my friend's pom pom seemed to handle that. It closes immediately after they pass. I will continue to buy these as a replacement and cannot recommend them highly enough!
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