I think there's too many variables to say for sure.
Yeah, it's easy to sit behind a computer and say, "If it were MY catchdog..." or "...by all means a cull" but in reality who owns a dog that hasn't made a mistake?
Culling is rarely easy, but it is necessary and required.
One of my absolute best dogs a couple months ago took a notion that when I turned him out of the box he was going to straight shoot me the finger and crawl under the buggy. I usually don't do this, but this went on for a few weeks until one day I had enough and he got the raw end of a pretty good switch. Didn't take long and he got his mind right. According to what I'm reading, I suppose now he's a cull.
IMO, I believe the comparison is apples to oranges.
Personally, as (mentally) young as the dog AND being that this dog is 1/2 cur (if the one I'm thinking of) I would definately give him another shot. If it happens again, then you might have some thinking to do.
If it's half cur...then, personally, I wouldn't expect as much out of it, as I do out of a AB, APBT, Dogo, or crosses of these 3.
