This option will keep your kitty nice, cozy, and warm during the cold months with a vinyl door flap and a heating pad. (americas-pet-store.com)
One of my backpack hands activates the front door flap to open, and we pass through and out to the street where we nearly miss the school train. (science.howstuffworks.com)
Suggestions for making this family room look nicer: clear it out completely, clean the dirty dog door flap, remove the cheap vinyl floor tiles, and repaint the room. (uglyhousephotos.com)