Your pup is testing his boundaries, and yours, with the barking and biting. And the fact that you back down out of fear and ask your partner to take over is just encouraging him to continue with it.
I’ve been challenged with my rescue, who would come up her leash at me when I first got her. Firm, clear corrections and a firm and confident voice stopped her from doing it. She would test it occasionally for the first 4-5 months, but she always got the same reaction from me, which taught her that her nonsense wasn’t going to be rewarded. Our pup now (15 weeks) tries it too, and I ignore her behavior and redirect it. So if she is chewing something she shouldn’t be, and I tell her no, she will bark at me try to nip. Instead of paying attention to that, or what she is trying to keep me from taking, I tell her no in a firm voice, give her another command, usually the “back” command, and start body blocking her and having her back away from me. She does well when redirected with another command. If it’s not something that will harm her, but she shouldn’t be chewing on it anyway, I’ll still tell her no, and give her a toy she can chew on, and when she takes it, I give her a good girl. She does get to a point where nothing is working, and she is just acting out like a spoiled toddler because she needs a nap, literally. She goes into her kennel then for some down time, and when she wakes, she is much better behaved.
But allowing yours to get that reaction of fear from you is just going to increase the behavior, and could end badly with an actual attack. He’s only 6 months old now, he’s a toddler, pushing his limits, and your letting him. When he’s 6yrs old and still getting away with it, it’s because he’s trained you, not the other way around.
If you’re truly afraid of him, I would suggest having your partner crate him before leaving, so you aren’t put in that situation until you can get your trainer in your home environment to assess the behavior and show you the proper way to correct that. Either that, or rehome the dog. He’s not going to get any smaller, and if he gets away with bullying you now, what are you going to feel when he’s an adult and no longer a pup? Have a long and honest conversation with your partner also. You shouldn’t be bullied into keeping a dog in your home you feel unsafe with.
Best of luck, and I hope you get more experienced advice from more senior members here!
Last edited by Jchrest; 06-27-2019 at 09:06 PM.