Simple, Obama clearly did not write his bio, but his handlers did, ones that were steeped in American culture, not the Muslim one that Obmama grew up in.
In America eating dog is a thing of shame, of poverty, in Islam eating dog is a thing of perversity, something only an infidel would do. If you were forced to feed your children something that would ban them to hell, and bring them great shame, would you tell them? Or would you call it chicken?
Why on Earth would they make up such a thing as Obama being served dog meat as a child? Maybe his stepfather wasn't too serious about his religious faith.
"the president recalls being fed dog meat as a young boy in Indonesia with his stepfather, Lolo Soetoro."