if the blood work comes back all fine and his thyroid is normal with no issues then its VERY possible he is just being a really really bratty hormonal dog, who is taking advantage of anyone who shows fear to him (like a bully at school, you show fear and the bully takes advantage and smashes your lunch every day and harasses you the minute you show you are afraid)
some dogs will take advantage of people who show fear, especially if they are insecure themselves... its a good possibility that he is just an insecure dog with weak nerves with alot of testosterone with having his balls still, so maybe neutering him will make him less of a bully per say....
you can also give him NO freedom. do NILIF Nothing in Life is Free
with him entirely, no furniture, no beds, NOTHING.... he must EARN everything, from food to pets to walks to attention... some dogs get too big for their britches at a certain teenage age, and its very possible your dog is at that stage.... its possible he got too much freedom and too much doting on and now that he is in his bratty stage with the fact that he is intact he is acting like a fool.... its worth it to try, NILIF doesnt hurt anyone, it just brings the dog down a few notches to where they belong and how they should act...
Kaiser has never been allowed on the furniture, ever. I have noticed though he will jump up on my mother when she is sitting in the recliner, and when she tells him to get down he whines and barks, just refuses, i tell him to get down off of her normally i say , " kaiser, look at me" to get his attention from his ranting and then, 'Down" and he gets right off her. And from a pup til about maybe 20 days ago he was only allowed in the kitchen and the living room, because he was getting into to much stuff, and i wanted to keep an eye on him. Now that he is out of that stage, he doesn't chew up anything anymore, I've let him into the hallway to the back tv room computer room...but there's a gate up on my room, my parents room ,the cats eating area, and on the music room, those are still off limits. If i am in them he will sit by the door.
I've always made him sit, and waited til he was calm before i would pet him. Especially if i came home from being out. My father not so much,and my mother never has. We had a dog, a mix shepherd and lab, for 15 years and i think they kind of treat him the same way as Timba, he was such a sweet dog, wouldn't hurt a fly, best temperament, i think its hard for them to switch over to thinking this is a different dog, breed, temperament, etc etc.
He has stopped growling and coming at me. He's completely off his meds now, i see a difference. Even my mother commented today that he is not as touchy. Clearly, it's not a solved issue, like tonight i was in my room and he was laying in the hallway next to it, he wouldn't let my mother down the hallway, i had to come out. I'm not sure if he's guarding me, or just the space...I'm really not sure. Because when my mother coughs ( she has a cold) he will mostly growl at her, if i'm in the room. lol which doesn't make any sense to me.
He is being neutered, not as soon as i hoped because of the way the surgery schedule fell, but on oct 3rd he's going in. I'm a little nervous about coming home with him, because he doesn't;t seem to take any sort of pain well, he's a big baby, ha.
I should hear back from the trainer tomorrow.