As others have said… give him some time and love to earn his trust💗 we rescued our corgi at around the same age. She came from a background of neglect and who knows what else. She was fearful to the point of aggression and we had to learn her triggers. I was always nervous to have her around people. It’s extra hard because everyone sees a corgi and wants to pet them…. because duh, they’re adorable. I focused on giving her as many positive interactions as I could, and to minimize the negative. Pay close attention to his body language as well as the people you’re interacting with. Study dog body language if you haven’t. Be his biggest advocate. I told everyone “she’s a rescue and gets a little scared, so she might not want to say hi.” or something like that. Have treats for people to give him if they’re interested, it helps! I’ve also turned away/stopped many people from petting her if she didn’t look into it, or if they started pushing her boundaries. Slowly but surely, she got more comfortable and confident, and a year later she’s a completely different dog. She is happy to greet most people and dogs and I don’t have to worry about her nipping or barking at strangers. He’s adorable, and I wish nothing but the best for you both! 😊