Cooper is the king of barking in our house.
If Carter is in the bed with me (he uses the chest at the foot of the bed to get up and Cooper can't figure it out yet) and Cooper is on the floor, he has a distinctive bark - somewhat shortened in duration and not forceful - if he wants up too. If he wants Carter to get down and play with him, its a totally different language. It is sooo funny.
If Cooper wants to get off the bed, he has another bark.
Yet another type bark is the "I'm gonna get ya" bark that he uses when he hears a strange noise or thinks he hears/sees something.
Carter actually "talks" to me. Its not a bark at all.