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To measure the right size for a pet door, start by measuring your largest pet. The flap should be at least one inch taller than your tallest pet and at least two inches wider. It's also important to measure the step-over, which should be no more than one-third of your pet's height from the floor to the back.

Pet doors are safe when you implement proper security measures. Opting for models with locking covers or electronic controls—such as microchips or collar-activated sensors—enhances safety by ensuring only your pet can use the door. These features are especially valuable if you have young children or want to prevent stray animals and intruders from entering your home.

Pet doors can affect your energy efficiency by allowing outside air to enter and affect the temperature in your home. You can minimize this impact by choosing a high-quality, insulated pet door that's properly sealed and weatherproofed. Investing in energy-efficient models helps maintain indoor temperatures while giving your pet the freedom to come and go.