This rang a bell with me.Perhaps? He is very bonded but maybe not as much as the previous two(?). Unfortunaly I have been a little unwell the past year or more. So this fellow has grown up much more as an urban dog. And spent far more time in the backyard by himself. Though my first had to cope with me being in a day job ,most of his life. He did have grandparents to entertain him.

More activity, a lot more training. And patient bang, gun, and gun smell training. Definitely some rabbits and birds as part of it.