A young boy is being hailed a hero for protecting his little sister from a dog attack.

Six-year-old Bridger leapt into action at Cheyenne, Wyoming, when he saw the animal get close he put himself in harm’s way to ensure his sister didn’t get hurt.

The boy’s aunt Nikki Walker has posted an account of the horrifying story and Bridger’s brave actions on Instagram.

She wrote: “My nephew is a hero who saved his little sister from an attacking dog. He, himself, took on the attack so that the dog wouldn’t get his sister.”