It just breaks my heart thinking he would come from an abusive breeder. I really hope I can help him. He's a really sweet lil guy and I can tell he could have a great personality under all that anxiety and fear. I don't want his fear to turn into aggression though, he's going to be a very large dog, so I definitely have a lot of work to do. Thank you all for your help! I posted some photos of him on here.
p.s he's great at taking photos , he doesn't move lol