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Travis Coates, at age 14, becomes the man of the house when his father leaves for a cattle drive to Kansas. He must take care of his mother and little brother, Arliss, at their Texas frontier farm. Travis receives instructions from his father about his responsibilities and is given a horse and rifle.

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A big yellow dog appears at the farm, stealing food. Though Travis initially dislikes the dog, Old Yeller wins over little Arliss. The family discovers that Old Yeller is extraordinarily skilled at marking and catching wild hogs. Travis begins to appreciate the dog's usefulness.

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Old Yeller saves Arliss from an angry mother bear when the young boy tries to 'catch' a bear cub. This heroic act changes Travis's opinion of Old Yeller, and he begins to form a strong bond with the dog.

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Travis and Old Yeller work together to catch wild hogs for marking. During one such expedition, Old Yeller saves Travis from a charging boar, proving his worth as both a working dog and a loyal friend.

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Travis falls ill with a fever while working in the corn patch. Old Yeller stays by his side throughout his sickness, demonstrating his devotion. Meanwhile, the dog helps protect the family's corn from raccoons and other wildlife.

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Old Yeller protects the family's cattle from wolves. During this time, Bud Searcy and his daughter Lisbeth visit, bringing news of hydrophobia (rabies) spreading in the area. They also reveal that Old Yeller belonged to their family.

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Travis and Old Yeller help a cow stuck in mud. The cow, delirious from hydrophobia, attacks Travis, but Old Yeller saves him. Unfortunately, during the fight, the cow severely injures Old Yeller.

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While Old Yeller recovers from his injuries, Travis takes care of him. The family becomes concerned about the possibility of Old Yeller contracting hydrophobia from the cow. Lisbeth gives Travis a puppy - Old Yeller's son.

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Old Yeller begins showing signs of hydrophobia. Despite Travis's hopes, the dog becomes dangerous. Travis's mother confirms that Old Yeller has the disease and must be put down to protect the family.

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In the most heart-wrenching chapter, Travis must shoot Old Yeller to protect his family from the rabies-infected dog. He learns a difficult lesson about life, love, and responsibility. The story ends with hope as Travis begins training Young Yeller, Old Yeller's puppy.