How long do yall keep a pup before culling

Different elements can and will affect dispositions to certain degree. I have also gave pups to friends that immediately began to work better. Environment change can shake em up sometmes. But the question with that dog will always be.....does it have to have a perfect environment to be able to perform adequately from know on?

I like to spend more time with the ones that do it no matter what the temp, how many dogs or poeple present, tornado watch...ect. they are gonna perform under any circumstances.

Without doubt you can get good dogs either way..but never had a great dog that I had to ask myself these questions about.