Answer:
Both Oscar(or his store) and the driver
Explanation:
Both the driver of truck and the store whose truck the river was driving would be liable for melnick whose dog was hit. The store will would be liable because, they are the employer of the driver. The store employs the driver to drive its goods and as such they will ne responsible for the driver whenever the driver does any misdemeanor with the company's truck in his care. The driver will be responsible due to his negligence and also being away from his normal duty.