WARREN, Mich. – A third-grader is bandaged and bruised after being attacked by a large dog Sunday while riding his bicycle in Warren.

The boy said the dog's owner just kept walking when the attack happened, and now an investigation is underway.

The boy's family believes the dog owner lives nearby, and they've been extra vigilant since the incident. The woman was walking two large dogs, each weighing around 70 pounds. One dog was white and brown, but the dog that bit Matthew Butzu was a short, heavy-set, stocky black dog.

Matthew, 9, is still healing after being bitten on the leg.

"It was kind of scary to be riding a bike and have a dog chase after me and bite you for no reason," Matthew said.

Matthew was riding his bicycle Sunday afternoon on Racing Road near Ridgefield Avenue. He was on his way to a friend's house when he passed the woman walking her two dogs.

"The dogs have really long leashes," Matthew said. "The black one chased forward, tried to bite me and succeeded."

Matthew said the owner knew what her dog had done.

"I pulled up my pant leg," Matthew said. "She saw it bleeding and left. She asked another guy walking, 'Is he OK?' He didn't answer and kept walking."

Matthew was able to bike the rest of the way to his friend's house, and his parents rushed him to the hospital. The family doesn't know anything about the dog that attacked Matthew, such as if it's up to date on vaccines or if it has attacked someone before.

Matthew had some advice for the dog owner.

"I feel you need to watch your dog," Matthew said. "You shouldn't stand there, and make sure your dog can't bite people."