If you want to adopt a two-year-old horse dog, will it be difficult to recognize the owner?

My dog, nine months old, only recognizes our family of four, and acquaintances can touch it. Our family traveled for four days and stayed at a friend's house. For four days, I haven't eaten or drunk, and I scream at the door every day. He never dared to travel with his family again. Dogs have recognized their owners, so it is best not to go when they are two years old.