A pack of puppies live on a farm in the bush field with one of them being a scar face dog named Jock. One morning during a game of tug-of-war, the puppies get disturbed by a jealous old man who wants to sell the farm and the puppies and win the bush field of the wheat. Jock tries to use his bark to defeat the old man but fails when a squeaky sound comes out instead.
Later that night, Jock ventures out of the farm for something to eat and gets nearly pursued by a wolf and a vulture, but is saved by Old Yeller. Old Yeller explains that he once had an owner named Big Arlie who adopted him when he was little but died from a disease leaving him to survive on his own. The next morning, Jock once again meets the old man that also has a dog of his own Ol' Bonnie. They try to drown him in a bucket of water but Old Yeller arrives and saves Jock, and later encourages him to survive on his own when the farmer passes away. Later the farmer passes away leaving the puppies orphaned, and Jock is unable to find Old Yeller.
Bonnie attacks Old Yeller leaving him wounded and badly scarred, but Jock rescues him by splashing him with the bucket of water they tried to drowned him in earlier that morning. As they make a campfire for the puppies to survive the night, Jock realizes that Old Yeller now has a scar most likely as his as his scar was burnt when a small fire approached at the end of the barn in fall. He then falls asleep and has a dream about becoming like Old Yeller. The next morning, a hurricane arrives and tears up the barn while the puppies and Old Yeller evacuate to shelter nearby that not only causes destruction in the flatlands, but also damages the bush field they were meant to harvest that winter. After a sad look at the damage, Jock finds Old Yeller’s collar laying in one of his water bowls.
The old man and Bonnie investigate to find Jock and replace him with a small puppy. Jock finds Old Yeller and explains that his owner didn't die from the disease, but needs treatment to get well. Just then the puppies end up getting captured by Bonnie who trasp them in a bag filled with rubbish and takes the bag into the cabin. When Jock and Old Yeller burst inside, they are shocked to find out that it was Old Yeller's old barn that he lived in before he moved out.
During the fight to save the puppies, Jock ends up causing a fire that burns the whole structure. Old Yeller then realizes that his owner is in the hospital room and rushes to save him. Jock threatens to give him a scar like he did to Old Yeller before, But then finds Old Yeller laying unconscious as a vase fell and hit him on the head. Bonnie then slowly regains his focus and rescues Old Yeller by pulling him out of the hospital room with his owner, just before the cabin burns down to the ground. Jock then wakes Old Yeller up by licking him on the cheek before letting out a bark much to everyone’s joy.
Bonnie and Old Yeller are adopted in a family and the old man becomes a business partner with Old Yeller’s owner, and Jock becomes the guard dog of the farm by becoming Jock of the bushfield. In a post-credit scene, the wheat is harvested after it turns golden ending with a now grown up Jock winking at the viewers.
