I would file a restraining order against his !pm and have her license revoke and let them know that she is abusive and controlling. It sounds like he is a momma boy. I would explain that the dogs is your and not here and no she can't see the dog or come over anymore

I am going to give you some scissors to cut the umbilical cord.

On a serious note, whilst you say a lot about what his mother does, you don’t say much about what your bf does to stop her madness. Unless he’s on board with you, then it’s a dead end relationship.