My daughter climbs through ours all the time we dont trust her with a key because she loses them all time and cant trust her with a key safe on the house as she gives her friends the number
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So if we are out and she comes home she climbs over the gate and through the dog flap
Our dog died and we darnt seal the flap up incase she cant get in.
Surprisingly easy to get through for a smaller person, neighbours girlfriend was probably a size 4/6 and the dog was a husky so the flap was pretty big compared to her size. My daughter gets through our medium dog flap with ease but then she is tiny.