Why is karanas goal to kill the wild dog in the story the blue dolphin?

Karana's goal to kill the wild dog in "Island of the Blue Dolphins" is motivated by revenge for her younger brother, Ramo, who was killed by the same dog. It represents her fierce determination to protect her family and seek justice for the harm that the dog has caused. It also symbolizes her determination to survive and assert her place as a capable and independent young woman on the island.