I was reading about this on another website last week & I don't believe in this in the truest sense as that would be to "kill" them, however from your post timber at least you have to let them get old enough to find out if they won't cut it a dog would have to make it to a "certain" age to find out. And at what age would that be ?
In my opinion, they would certainly have to get through the puppy stage as maturity veries with different breeds. Then at least through enough training to the point you you have to make a decision do I keep this dog, or not waste any more time on them and go on to another.
I do believe that to make a breed better and not allow those genes to go forth and breed, yes have them spayed or neutered.
But certainly not culled, they may be what someone else is looking for or a good family pet and still have some usefullness and maybe adopted or given to a rescue that will place them with a good home.
JMT
In my opinion, they would certainly have to get through the puppy stage as maturity veries with different breeds. Then at least through enough training to the point you you have to make a decision do I keep this dog, or not waste any more time on them and go on to another.
I do believe that to make a breed better and not allow those genes to go forth and breed, yes have them spayed or neutered.
But certainly not culled, they may be what someone else is looking for or a good family pet and still have some usefullness and maybe adopted or given to a rescue that will place them with a good home.
JMT