A Utah bus driver claims he's not racist because his dog is black, as he faces accusations of intentionally dragging a biracial student down the road.

John Naisbitt, 78, is accused of refusing to stop his bus after the doors caught on the 14-year-old boy's backpack, dragging him down the street.

CNN reports Naisbitt has been accused of abusing biracial students in the past, but he claims he's not racist.

"Not at all. Look at my dog. He's as black as can be," he told reporters.

Naisbitt claims he did not see the boy and he would have stopped if he had noticed he was stuck.

But the boy's mother, Brenda Mayes, is upset and has launched a civil rights lawsuit, claiming her son was targeted due to his skin colour.

"I was glad he didn't kill him. I was glad he didn't go under the wheels," she told CNN.

Naisbitt has now retired from the role. A spokesperson for the school district that employed him said the incident was being investigated.

"When issues of discrimination are raised at any time, they are investigated thoroughly.

"The Davis School District takes any claims of racial discrimination seriously and does not tolerate any form of racial discrimination in our schools"

Newshub.