How do my fiance and I compromise about the dog's behavior?

This sounds like a very hard situation. Dewey is basically Jared's baby. I would talk to him and let him know thar this situation is very new to you. Dewey needs more training, and Jared has to understand your point of view. I think it can work if you both come to an understanding of what to do. Dewey should not be sleeping in bed with you both. He should sleep in the living room or in his doggy bed. Dewey is basically a baby in training and so far Jared made a lot of bad decisions. I hope everything works out. Good Luck :)