T.U.
You've gotten a lot of really good advice so far. My Brayden just went through this phase a couple months ago. First he hit out of fun, but then he would hit me hard when he got mad. For the hitting out of fun, I would hold his hand and rub my cheek softly saying "gentle" while I did it. This helped him to be gentle with everyone's dogs too. And it didn't take to long for him to catch on. When he hit me out of anger I would hold his hand, look him in the eye and FIRMLY say no. Then I would put him down and walk away. Of course this broke his heart, and he would cry miserably for a while. It's really hard to let him cry, but you have to do it. When you do pick him up DON'T soothe him. Just hold him. We got rid of the hitting situation pretty quickly this way. But a couple weeks ago he started biting out of anger. He has a bit of a temper, and isn't afraid to show it. I hope your Brayden doesn't go through this too :)