During my years of keeping working dog’s I’ve noticed that those that show ‘feral’ traits from a young age tend to make the better workers.
things like burying bits of food even when eating with their litter mates, padding their beds down and happily crawling into dark tight spots to sleep, instinctively grabbing anything that go past them, they have that instinct to hunt and kill from a very young age, naturally gravitate towards you as the alpha and want to please you and be around you.
these are just a few things and obviously other pups will display some of these traits but in genera