The SureFlap Microchip Cat Flap is a pet-friendly lifestyle product designed for cats, allowing them to safely access doors and control their access to specific areas. 

My cat got too fat and can't use it anymore. 

7.5" (W) x 6 ¹¹⁄₁₆" (H)

This dimension is the smallest area of the pet door that your pet will have to enter when the flap is open.