S.B.
No fever and no symptoms - I would definitely send him. Some kids, especially under two, seem to get what I call "no reason fevers." They mostly pop up at bedtime, are easily controlled by Tylenol or Motrin, and seems to have no real cause. I always thought that when it happened to my kids, it was their defense system kicking in to overdrive for one reason or another (growing, teething, mild bug, etc).
Hopefully he will be just fine tomorrow :)