Old Sultan

"Old Sultan" is a German fairy tale collected by the Brothers Grimm. It combined three different types: the old dog rescues the child; wild animals hide from an unfamiliar animal; and the war between the village animals and the forest animals.
A farmer's dog named Sultan had grown old. One day the farmer told his wife he would kill Sultan. The dog heard. A wolf told him that they would take their child haying the next day, and the wolf would carry him off. Sultan could chase him, and he would free the child. They would be grateful and not kill Sultan.