Also, the automatic gravity-actioned locking mechanism will ensure you can open and close the door smoothly and reduces the chance of dogs unlocking by themselves. All of this is designed for absolute safety, so you can really relax. This item is in the category "Pet Supplies\Dog Supplies\Fences & Exercise Pens". The seller is "home88led" and is located in this country: US. This item can be shipped to United States.