As the summer heat scorches across the US, this little girl and her Rottweiler best friend have one of their typical races in the pool to stay cool.

The Calcutta, Ohio besties have been close since Kenzie was born, according to her father Greg, who filmed the daring dash between dog and girl.

"Their favorite activity is swimming, and they love to "race" each other in the pool. If nobody wants to swim, Max makes his own fun. He'll drop an empty water bottle over the side then go fetch it himself," Greg told Newsflare.

The clip was filmed on June 18.

Max and Kenzie have been close since she was born. Their favorite activity is swimming, and they love to "race" each other in the pool. If nobody wants to swim, Max makes his own fun in the pool. He'll drop an empty water bottle over the side then go fetch it himself.