This is the hilarious moment a pet dog dragged his friend down from a wall - so he could reach the top first.

The black-and-white pooch was clambering onto the concrete ledge and had almost reached the top when his 'friend' had other ideas.

Footage shows how the mischievous mutt nipped the other dog's bottom to drag him back down. He then jumped onto the top of the fence and nudged the other dog - making him drop down to the ground below.

Resident Thanaporn Jantharat witnessed the helpless pooches struggling to enter her uncle's house in Udon Thani, Thailand.

She said that at first, it seemed like the dog was trying to help its friend climb the wall by giving it a boost with its own head.

However, it was actually showing its dominance by refusing to let the other dog climb onto the wall.

Thanaporn said: "It was so funny watching them interact like that. I think they must have been having a doggy argument over whose territory it was. It was interesting how much effort they put into their little tussle.''