dog adopts monkey
http://www.reuters.com/news/video?videoId=20366
From 1724 there are records describing a naked, brownish, black-haired boy who was found running up and down in the fields of the German town of Hamelin. The "creature" was enticed into town, and once there immediately became a subject of great interest. He behaved like a trapped wild animal, eating birds and vegetables raw, and when threatened, he sat on his haunches or on all fours looking for opportunities to escape. The boy was given the name "Peter" and was soon made the possession of King George I of England, where he lived the rest of his life. During his life Peter never learned to talk, showed a complete indifference to money or sex, and was never seen laughing. However he loved music, and he was able to learn a number of menial tasks before he died in 1785.
Another example is a boy named Victor who was discovered foraging for roots and acorns in the woods near Aveyron, France in 1799. He appeared to be about eleven or twelve years old, but he didn't speak. He was taken to Paris, where he resembled a human only in appearance. Victor behaved like an animal, he ate rotten food with pleasure, he was incapable of distinguishing hot from cold, and he spent much of his time rocking back and forth like a caged animal. He was taken into the care of the brilliant scientist Dr Jean-Marc-Gaspard Itard, who dedicated himself to the education of the boy. Victor proved to be a very difficult subject. Over the years, he only learned two terms, "lait," and "oh dieu." His sense of touch seemed to be far more important than his sense of sight, and he did not demonstrate an ability to distinguish right from wrong. Like Peter before him, he was indifferent to sex, and he did learn some menial tasks, such as setting a table. Victor lived the rest of his life in the care of his housekeeper, and died in 1828 at the age of forty.