Review on 🐾 Endura Flap Pet Door: Extra Insulated, Energy Efficient, and Durable Doggie and Cat Door for Small, Medium, Large, XL Pets. Available in Black, Tan, and White Frame Options with Locking Cover by Tammy Stephens

I know what you're talking about, $200-$400 for a dog door? I asked the same question and remembered all the cheap dog doors I'd used in the past that kept out flies and mosquitoes, increased my heating and cooling bills because they warped and wouldn't stay closed after a month or two. This item is backed by a 15 year artificial warranty in the USA. This is actually the name of the person who created it and tested it by QA. The flap is stiff but soft on your dog's nose. They might be scared of it for a day or two, but if you talk them into it a few times a day, they'll get used to it. Magnets help keep critters like mice and rats away. I don't know what else to say about this door. It costs money and lasts a lifetime.