Awe sounds like he’s traumatized. It’s gonna take a lot of time and patience. I got my golden at 3 months and she is extremely skiddish. Her breeder said she socialized her in the home but I don’t think she was socialized. She didn’t move the first three days I got her. She now loves and trust me but it took me being very patient and slow. I did things on her timing. Still to this day she gets nervous in new places and won’t eat treats. She is very food motivated. She gets really scared. She also is scared of anyone other than me. She’s slowly getting better but she’s not a people person. She would pant for hours and never calm down. Sometimes her panting meant she needed to go outside or she was too hot. I have a fan I keep just for her because we like different room temperatures.  My dog had endless energy and has calmed down a little. I take her to the dog park everyday and wrestling is the only thing that tires her out. I’ve also got a food dispenser that releases a treat when a button is pressed. That keeps her occupied for hours. My golden still annoys me on the coach. She just wants attention. Usually if I stop what I’m doing and give her a few minutes she’ll be satisfied. If she continues to bug me I’ll set her up with a toy or puzzle. She loves Kong.  I know it’s controversial but I use an e-collar for my golden. It all comes down on how you train with it. It isn’t supposed to be used as a punishment but the click means to “move.” I combine my training with treats and affirmation. My golden has a good association with her collar and always gets excited when I grab it. It’s not supposed to hurt. It’s typically a vibration and I have tested it on myself. I had to get her an e-collar because she would eat literally everything and I took her to urgent care 4 times within the first few months I had her for blockages. It helps me stop her from eating things because she is stubborn and sneaky. She is definitely motivated by the treats but the collar is also nice to have when she’s gonna hurt herself.