Dog is not halal, and eating dog is prohibited in Islam. Furthermore, dog is not eaten in the part of Indonesia where Obama lived. So the statement in his book may not even be true.
I just checked with an Islamic website.
Dog is considered unclean, but everything can be eaten as long as it is blessed bay Allah............
And stray dogs do seem to go missing in the vicinity of Bill Ayer's house.
They do so.
Moslems might not eat those things but in Indonesia there are Chinese origin people who fake it so they can benefit from being considered part of the ruling class of Moslems.
I have no doubt a guy named S'oe'taro would happily snag some dog meat.