First of all if you found hair you hit him.

Second deer will generally hunch up on a gut shot, one indication of a heartshot is a deer mule kicking with his hind legs.

How far did you track this deer? Certain hits may not produce blood for 20-30 yards, some may be a killing shot and hardly bleed at all.

I would say from what you have said the deer was hit hard and you need to get out there and do some serious tracking, more than likely that deer is down for the count with in 100 yards, maybe more.