【Adjustable door strap and door stop】The simpler way to keep dog out of room with litter box and cat food while still allowing your cat to have easy access. Plus, the handy cat door stopper will prop your door open and prevent your pets from accidentally closing the door. It is also preferred over a dog gate with cat door or cat doors for interior doors. 【Cat door holder latch】Holds most doors open 4" Our one-piece design easily hooks onto most doorknobs and will safely hold the door, protecting your cats private space from larger animals! Perfectly sized for your cat to feel comfortable and confident that no intrusive dogs pester them in their private space! 【How does it work】Pet door strap allows the door to any interior room to open just wide enough so cats can easily enter or exit, but at the same time keep it narrow enough so dogs (if slightly larger than cat) cannot get in. The pet door stopper prevents the door from closing and serve as a guard to prevent pinched tails (or