what is to young ?

I show one a small pig at about 3 months just to see how they act and then go from there. I usually start one in the woods at about a year old. As far as getting opne cut at a young age and them coming back from it I've seen that go both ways. Some will never be the same and some it will only make them want it more.. Just about all of us have had dogs that were doing good at first and then got roughed up a few times when they were young and ended up being a cull. Then we say well he got ruined by getting cut up young. But I wondfer if that's really what happened or is it that they just never had it to begin with and never would have.. I wonder how many of them dogs would have actually made it had they not got roughed up early..