We purchased this door because our cat wanted to defend its territory. We also had 3 dogs, a 90+-pound Lab mix, an 80+-pound Lab mix and a Sheltie. The door installed easily, and the dogs learned to sue it within minutes. We had visiting dogs (2 more... large Lab mixes) and they learned to use the door as quickly. Our only problem was with the collars, until I used small cable ties to keep the case together. Since that time not problems with losing the case top and inside electronics, we had had the door about three years. Recently a problem developed with the mechanism, it did not respond at all unless someone struck a blow on the door adjacent to the pet door. Checking with the manufactures web site indicated this failure require a replacement of the main circuit board. The manufacturer will rebuild the door for about half the cost of a replacement with a new door and provide a new warranty. Shipping time is the only consideration in all this, leaving the door non-functioning whether ordering parts, a new door or refurbishing the old door. We have had excellent success with the door for several years, and in spite of the current problem, I would recommend this door to everyone. Read more Less
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