This is the heartwarming moment a schoolgirl squeezed through a dog flap to visit her grandmother.

Two sisters were visiting their grandma when they discovered no one was home, leaving them unable to enter the house in Jiangsu, China, on October 19.

Footage shows the younger sister attempting to crawl through the small dog door on the gate.

She is seen struggling to fit through as her older sister laughs at her in the background.

Moments later, she successfully squeezes through the tiny opening, much to the amusement of her sister watching from the car.

The filmer said: 'Once she entered the compound, she opened the gate, and we waited for them to come back home. I wasn't worried she would get stuck because I know how flexible my sister is.'