Small instructions:

• Don’t ask him anything
• just take small walks and always the same route until he knows every blade of grass by heart
• Praise him in a soft voice as often as you can
• Don’t give him treats
• Don’t try to stroke him
• Leave him alone when eating
• Avoid unknown situations and loud noises and …
• Give him a lot of time and wait for him to come to you!

In time, he will have unlimited confidence in you.

If you stick to these points, you have a good chance that it will become a dream dog!