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If you're looking for an option to let your pet inside and out without worrying about them leaving unwanted "gifts" within the home, then consider getting a upvc door panel with cat flap fitted. This is less expensive than replacing the entire door, and is easier to put in. Although it is possible to install an animal flap inside your own uPVC door, you need to be aware that this is a tricky job that could result in expensive mistakes. Easy to install If you have a cat or dog in your home, it's import