Sturdy Structure: The cat door stopper can withstand severe abuse from the rudest dogs on the block. In terms of design and packaging, our nylon and construction can hold back the most determined puppies. Care of Your Pets: The one piece design of our pet door stopper easily hangs on most door handles and secures the door securely, protecting your cat's private space from larger animals. Simple to Operate: Our cat door alternative is simple, convenient, and effective! Fitting in seconds, with adjustable door width, it's the perfect solution for dog proof litter boxes and dog proof cat feeders. Adjustable Door Strap and Door Stop: The cat door holder strap keeps dogs away from cat feeders and keeps your cat within reach. Plus, it holds your door open and prevents your pet from accidentally closing it. Perfect Option: Cat door stopper can be used to stop crawling babies, toddlers, large dogs, puppies from entering any unwanted and unsafe room such as laundry, bathroom, closet, bedroom, pantry or office, a simpler and less cumbersome way.