The dog house we purchased needed a door. This was so easy to install and works great.
Haven't had it that long, but it is made with sturdy plastic that seems to block the cold out while still translucent to look through. We have feral cats that are currently adapting to it. I've seen one of four cats go through it, so I have hope for the others.
Was food siE little stiff when we using it for cats to go in an out of outdoor house
I chose to litter box train my 13lb pug so she wouldn’t have to go outside during winter or mosquito season. She kept going outside her litter box from time to time. The flaps gave her clear definition of where inside the litter box and outside the litter box are. No more accidents outside the crate. Love that they are clear so she can still see fine.
We installed two of these about a month ago. After a few days of below zero temps, two of the flaps completely snapped off. Would not recommend for cold weather. Also, the plastic is a lot harder than I expected and not very flexible.