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Allowing your cat to leave and enter the house whenever it wants is an excellent way to keep your pet physically active and mentally stimulated. A flap can help reduce toileting accidents by making it easier for your cat to exit the house when it is required to. Measure the Door A cat flap lets your pet to come and go at their own pace, without opening the door for them. This is ideal to keep them in the house when you're home or away, and helps keep unwanted pests out of your home as well! It is important to take measurements of the door to ensure that y